CURRENT ELECTRICITY

A) FILL IN THE BLANKS.

1) Rate of flow of charge is called___.(current/resistance)

2) The flow of current is due to the motion of____.(Protons/electrons)

3) The work done in moving a positive charge across two points in an electric circuit is a measure of_____.(resistance/potential difference)

4) The current is____ proportional to potential difference and___proportional to resistance.(Directly/inversely)

5) The SI unit of current is ____.(Coulumb/ampere)

6) The combined resistance of any number of resistors connected in____is equal to the sum of the individual resistors.(Parallel/series)

7) The SI unit of potential difference is ____.(Watt/volt)

8) A cell converts____energy into____energy.(electrical/chemical)

9) The specific resistance does not depend on the___of a conductor.(temperature/dimensions)

10) The SI unit of conductance is _____.(ohm/ohm⁻¹)

11) The SI unit of resistance is_____. (Ohm/mho)

12) E. M. F of a cell is potential difference in___circuit.(a close/an open)

13) If n equal resistance are put in parallel, the total resistance is equal to___. ((Rn/R/n)(reciprocal/same (

14) The SI unit of resistivity is ____. (Ohm/ohm-m)

15) Conductivity is____of resistivity.(parallel/reciprocal)

B) State whether True or False. Also correct the false statement.

a) Potential difference between two points is less than the work done in moving a unit positive charge from one point to the other.

b) The emf of a cell depends on the shape and the distance between the electrodes.

c) A good conductor of electricity offers more resistance.

 

d) The resistance of a wire decreases with the increase in its temperature.

e) it is advantages to join the cells in series only if the internal resistance of each cell is high energy compared to external resistance.

C) ANSWER THE FOLLOWING:

1) What is mean by the term electric current ? what is its SI unit ?

2) By what name is the physical quantity coulumb per second called ? 

3) Is a wire carrying current charged?

4) State whether electric current is a vector quantity or scalar quantity. 

5) Define an empier of current.

6) Electric field is applied across a conductor from north to south direction. Give the direction of drifting of electrons.

7) Is potential a vector or scalar quantity.

8) What is the SI unit of potential difference 

9) What is meant by the saying that potential at a point is 1 volt.

10) By what other name is joule/coulumb called?

11) State the relation between the potential difference, work done and charge moved.

12) Define the term 'resistance' Give the SI unit.

13) How does the resistance change with the temperature in a conductor ?

14) What are the factors on which the resistance of a conductor depends ?

15) A wire is stretched to twice its original length. Is its resistance change or not ? if yes, by what factor does its resistance change?

16) What do you understand by the term 'internal resistance' of a cell ?

17) Differentiate between resistance and specific resistance.

18) Define electrical resistivity of a material ?

19) On what factor does the resistivity of a wire depend ?

20) Which will have higher resistivity, a conductor or an insulator ?

21) State the order of resistivity of a metal, a semiconductor and an insulator.

22) A wire P is stretched to double of its length. What is the new resistivity ?

23) Why is an alloy manganin used to make standard resistance ?

24) What is the necessary condition for a conductor to obey Ohm's law ?

25) State the conditions under which the Ohm's law holds good.

26) you are given three resistance of 1 ohm, 2 ohm, and 3 ohm. How will you combine them to get an equivalent resistance of

a) 6 ohm.          In series 

b) 6/11 ohm.      In parallel 

27) Write an expression for the equivalent resistance R of three resistors R₁, R₂ and R₃ joined in:

a) parallel 

b) series

28) You have resistors of values 2 ohm, 3 ohm and 5 ohm. How will you join them to so that the total resistance is less than 2 ohm ?

29) Write an expression for the resistance of conducting wire in terms of it's length and area of cross section.

R= ρl/a , where ρ = Resistivity of the material of the wire, l= length of the wire, a= area of the cross section of wire and R= resistance of conductivity wire.

30) Mention two factors on which internal resistance of a cell depends.

D) SHORT ANSWER TYPE QUESTIONS 

1) State when it is most advantage to connect cells :

a) in series

b) in parallel

2) How does the resistance of the wire depend on its length ? Give a reason to your answer.

3) What are the limitation of Ohm's Law ?

4) What are ohmic and non-ohmic conductors ? Give one example of each and draw the graph to show their current-voltage relationship.

OR

 What are Ohmic and non-ohmic resistance ? Give two examples of each.

5) On what factors does the internal resistance of a cell depend ?

6) Manganin and Eureka are used for making standard resistances . Explain .

7) What do you understand by the term 'series circuit'?

8) Give three characteristic of a series circuit.

9) What do you understand by the term 'parallel circuit'?

10) Give three characteristics of a parallel circuit.

11) Why is not advisable to keep the cells connected in parallel when not in use ?

12) Why should the internal resistance of a cell be low ?

13) What is meant by e.m.f. of a cell ? In what unit is expressed ?

14) Explain why the potential difference across the terminals of a cell is more in an open circuit and it is reduced in a closed circuit.

OR

 Explain why is the potential difference across the terminals of a cell less than its e.m.f. when a current is drawn from it.

15) On what factors that does the resistance of a conductor depend ?

OR

Does the resistivity depend upon the dimensions of a conductor ?

16) State Ohm's law.

17) What is the difference between e.m.f  and the terminal voltage of a cell ?

MULTIPLE CHOICE QUESTIONS 

1) The electric current is due to the flow of :

A) positive charges only 

b) negative charges only

c) both positive and negative charges

d) neutral particles only

2) The work done in moving a unit positive charge across two points in an electric circuit is a measure of:

a) current b) potential difference c) resistance d) power

3) The device used for measuring potential difference is known as:

a) potentiometer  b) ammeter c) galvanometer d) voltmeter 

4) Which one of the following is the SI unit of electric charge?

a) watt b) ohm c) ampere d) coulumb 

5) Which of the following is an Ohmic resistance ?

a) diode  b) germanium c) diamond d) nichrome 

6) Ohm's law is applicable to :

a) discharge of electricity through gases 

b) diode valve 

c) all metallic conductors 

d) Ohmic conductors

7) In a circuit containing two unequal resistors connected in parallel:

a) the current is the same of both the resistors.

b) the current is larger in larger resistors.

c) the voltage drop is the same across both the resistors.

d) the voltage drop is large across large resistor.

8) When the length of conductor is doubled , the resistance of the conductor will:

a) remain the same 

b) double in value 

c) become half 

d) become four times.

9) Conductivity is the reciprocal of:

a) resistance 

b) specific resistance 

c) current density 

d) current 

10) The length of a conductor is halved. Its conductance will be:

a) halved b) unchanged c) doubled d) quadrupled

11) Which of the following statement does not represent Ohm's law:

a) current/potential difference =constant 

b) potential difference/current = constant 

c) potential difference = current x resistance 

d) current = resistance x potential difference

12) The resistivity of a wire depend on:

a) the length of wire

b) the area of the cross section of wire

c) the nature of the material of wire 

d) all of the above three factors.

13) The SI unit of Resistivity is :

a) ohm b) ohm/m c) ohm x m d) mho

14) If a wire is stretched to make its length 3 times, its resistance will become:

a) three times  b) one third c) nine times d) one ninth.

15) When the temperature of a metallic conductor is increased, its resistance:

a) always decreases 

b) always increases

c) may increase or decrease 

d) remains the same.

16) Potential at the surface of the charged body:

a) is the same all over the surface 

b) depends on mass

c) depends on the shape of the surface

d) none of them 

17)  An external resistance R is connected to a cell of internal resistance r. The current in the circuit is maximum when:

a) R> r b) R< r c) R= r d) R= 2r

18) The specific resistance of any known material is not affected by change in:

a) temperature  b) pressure c) applied magnetic field d) dimensions 

19) For which of the following substances , resistance decreases with temperature ?

a) copper  b) Mercury c) Carbon d) platinum

20) The equivalent resistance in series combination is:

a) smaller than the larger resistance.

b) larger than the largest resistance.

c) smaller than the smaller resistance.

d) larger than the smallest resistance.

21) Four cells each of e.m.f are joined in parallel to form a battery. The equivalent e.m.f of the battery will be :

a) 4E b) E/4 c) E d) zero 

NUMERICAL PROBLEMS

1) The voltage across 3 Ω resistance is 6V. How large is the current ?     2A

2) What is the resistance of a filament lamp when a voltage of 3V across it causes a current of 0.5A ?        6Ω

3) Four resistors of resistance 0.5 Ω, 1.5 Ω, 4Ω and 6 Ω are connected in series to a battery of e.m.f. 6V and negligible internal resistance. Calculate 

a) the current drawn from cell.     0.5A

b) p.d. at the end of each resistor.      0.25V, 0.75V, 2V, 3V

4) Five resistors each of 3 Ω, are connected as shown in figure.

Calculate the resistance:

a) between the points P and Q.     2Ω

b) between the points X and Y .      8Ω

5) Study the circuit diagram carefully and calculate:

a) the current in main circuit.     1.80A

b) the current in each of the resistors in parallel circuit.       1.2A, 0.6A, 1.2A, 0.6A

6) Figure shows a circuit diagram containing 12 cells,

each of EMF 1.5V and internal resistance 0.25 Ω. Calculate 

a) total internal resistance.     3Ω

b) total emf.        18V

c) total external resistance.      9Ω

d) reading shown by ammeter.      1.5A

e) current in 12Ω and 8Ω resistors.         0.75A

f) p.d. across 2.2Ω resistors .           3.30V

g) drop in potential across the terminals of battery.       4.5V

7) For the combination of resistors as shown in the circuit,

find the equivalent resistance between 

a) A and B.   2.25Ω

b) C and D.        8.25Ω

8)  Four resistances are connected as shown in figure. ar potential difference is applied between the points P and S.

a) Calculate the equivalent resistance between the points Q and the R.   1.2Ω

b) What is the equivalent resistance between the points P and S ?    6.2Ω

c) If the current flowing through the 3Ω resistance is 2A, what is the current through the 2Ω resistance ?     3A

d) What is the current through 4Ω resistance.       5A

e) What is the current through the 1Ω resistance ?     5A

f) What is the potential difference between P and S?    31 volts 

9) Figure shows a circuit diagram having a battery of 24V and negligible internal resistance. 

Calculate 

a) reading ammeter.     2A

b) reading of V₁ , V₂, V₃.    3V, 4V, 17V

10) Carefully study the circuit diagram shown below

and calculate the value of resistors x.  11Ω

11) A cell of EMF 1.8V and internal resistance 2 Ω is connected in a series with an ammeter of resistance 0.7Ω and a resistor of 4.5Ω as shown in figure 

a) What would be the reading of ammeter ?    0.25A

b) What is the potential difference across the terminals of the cell ?     1.3V

12)  A battery of emf 3V is connected in series with an ammeter, a 10 Ω coil of wire and with a parallel combination of resistances of 3 Ω and 6 Ω. Draw a circuit diagram for the above arrangement. What is the :

a) resistance of the parallel combination ?    2Ω

b) reading on the ammeter?        0.25A

c) potential difference across the 3Ω resistors ?     0.5V

d) current flowing through 3Ω resistors ?    0.17A

13) A cell supplies a current 0.6A through a 2Ω coil and a current of 0.3A through a 8Ω coil . Calculate the emf and internal resistance of the cell.     3.6V, 4Ω

14) Calculate the equivalent resistance between the points X and Y

in the network shown below:         1Ω

15) In the given figure

A, B and C are three ammeter. The ammeter B reads 0.5A. (All the ammeters have negligible resistance). Calculate 

a) the reading in ammeter A and C.    1.5A

b) the total resistance of the circuit.    4Ω

16) Calculate the resistance between point X and Y in the network shown below.   0.71Ω

17) Figure shows

a battery having an emf of 9 V and internal resistance of 0.6Ω, connected to three resistors A, B and C, Calculate the correct in each resistor.    1.08A, 0.72A

18) Calculate the equivalent resistance in the following combination of resistors r₁, r₂, r₃, r₄. 

       R= {(r₁+ r₂)r₃ + (r₁+ r₂+ r₃)r₄/(r₃ + r₄)

19) Four cells each of emf 2V and internal resistance 0.1Ω are connected in series. The combination is connected in series to an ammeter of negligible resistance, a 1.6 Ω resistor and unknown resistor R₁. The currenr in the circuit is 2A.

Draw a labelled circuit diagram for the above arrangement and calculate the total resistance in a circuit diagram for the above arrangement and calculate:

a) the total resistance in the circuit.    (2+ R₁)Ω

b) the total emf.     8 volts 

c) the value of R₁.          4Ω

d) the potential difference across R₁.      4V

20)  Two resistors of resistances 3 Ω and 2 Ω in parallel are connected to a cell of EMF 1.5V and internal resistance 0.3 Ω. Draw a labelled circuit diagram showing the above arrangement and calculate the current drawn from the cell.      1.0A

21) Given below is the circuit diagram

in which three resistance of 1Ω, 2Ω and 3Ω are connected to a cell of EMF 2V and internal resistane 0.5Ω.

a) Calculate the total resistance of the circuit .     2.0Ω

b) What is the reading of the ammeter ?        1A

c) What will be the ammeter reading if an exactly similar cell is connected in series with the given cell ?       1.33A

22) The following circuit diagram shows

three resistor 2Ω, 4Ω and R Ω connected to a battery of EMF of 2V and internal resistance 3 Ω. A main current of 0.25A flows through the circuit.

a) What is the potential difference across the 4Ω resistors.       1V

b) Calculate the potential difference across the internal resistance of the cell.     0.75V

c) What is the potential difference across the R Ω or 2Ω resistors?    0.25V

d) Calculate the value of R.     2Ω

23) In the figure shown below,

calculate:

a) the value of combined resistances of 40 ohm and R, using the reading of the two metres.     10Ω

b) the value of R.      13.3Ω

c) the current flowing through R.     0.3A

24) A cell of EMF 1.5V and internal resistance 10 ohms is connected to a resistors of 5 ohms, with an ammeter in series( see figure).

What is the reading of the ammeter ?    0.1A

25) Four cells, each of the EMF 1.5 V and internal resistance 2.0 ohms are connected in parallel. The battery of cells is connected to an external resistance of 2.5 ohms. Calculate :

a) The total resistance of the circuit.    3Ω

b) the current flowing in the external circuit, and the reading of the ammeter.    0.5A

c) the drop in potential across the terminals of the cells .     0.25V

26) With reference to the diagram given below, 

calculate:

a) the equivalent resistance between P and Q.    2.4Ω

b) the reading of ammeter .        1.66A

27) Four resistance 2.0 Ω if each are joined end to end to form a square ABCD. Calculate the equivalent resistance of the combination between two adjacent corners.    1.5Ω

Paper 3

1) Which among the following materials is not a very good conductor of electricity ?

a) copper  b) silver  c) platinum d) iron

2) Which of these substances acts as a non-ohmic resistors ?

a) nichrome wire 

b) tungaten filament 

c) copper wire 

d) aluminium filament 

3) if the resistance of a copper wire of certain length is R, then on doubling the length, its resistance :

a) will get doubled 

b) will become halved

c) will become quadrupled 

d) will become 1/4 th

4) The resistance offered by a conductor is directly proportion to its:

a) length

b) area of cross section 

c) both a and b

d) neither a nor b

5) With increase in temperature, the resistivity of manganin :

a) increases 

b) decreases 

c) remains unchanged 

d) any of these

6) Two unequal resistances are connected in parallel across a cell. Which of the following statements is true ?

a) current flowing through a smaller resistance is higher.

b) current flowing through larger resistance is higher.

c) current flowing through both the resistances is equal.

d) current can be higher in any resistance depending on the EMF of the cell.

7) In a series combination of resistors :

a) the equivalent resistance is reduced

b) the potential difference across each register is same

c) the current across each resistor is same 

d) both b and c 

8) The equivalent resistance of three resistors , each of 3 Ω resistance, when joined in parallel combination is:

a) 1Ω b) 3Ω c) 6Ω d) 9 Ω

9) Current is the rate of flow of _____per unit time.

a) charge b) free electrons c) total electrons d)  both a and b 

10) The SI unit of current is _____

a) ampere b) volt c) kiloampere  d) none of these 

11) 1mA is equal to ____ampere

a)  10 ampere

b) 10⁻³ ampere 

c) 10⁻⁶ ampere 

d) 10³ ampere 

12) Resistance is the opposition of flow of _____through a conductor.

a) free charges 

b) protons

c)  ions 

d) none of these 

13) SI unit of resistance is____

a)  ohm meter  b) mho c) Ohm d) siemen

14) Ohm's law is the relationship between_____ and_____

a) pressure, volume

b) volume, temperature 

c) voltage, current 

d) resistance, current 

15) Ohm's law,____ is directly proportional to____ keeping____ constant.

a) voltage, current, temperature 

b) current, potential difference, temperature

c) temperature, voltage ,current 

d) pressure, volume, temperature 

16) ohmic conductors are conductors which ____Ohm's law.

a)  accept  b) disobey c) neglect d) obey 

17) Slope of voltage v/s current plot gives_____.

a) resistance b) conductance  c) conductivity  d) resistivity

18) slope of voltage v/s current graph is variable in___

a) conductors 

b) Ohmic resistor 

c) super conductor 

d) non-ohmic conductors 

19) Super conductors are ____

a) substance with infinity resistance 

b) substances with zero resistance

c) substances with the large conductance 

d) substances with zero conductance

20) The slope of voltage v/s current graph_____ in series circuit.

a) decreases 

b) increases

c) remains constant 

d) varies 

21) The slop of current v/s voltage graph_____ in parallel circuit.

a) increases 

b) decreases

c) is constant 

d) cannot predict

22) For a given material of wire if length is doubled its area of cross section____

a) increases

b) decreases 

c) 1/4th the original area

d) halved the original length

23) Specific resistance is _____to the length of conductor.

a) independent 

b) dependent

c) directly proportional 

d) inversely proportional 

24) Electrical energy consumed by an appliance is measured in___

a)  kilowatt sec

b) kilowatt sec meter 

c) kilowatt hour 

d) watt hour 

25) Electrical energy is ____

a) Power in kW, Time in hour 

b) Power in kilovolt, Time in hour 

c) Power in kilovolt ampere, Time in hour 

d) both a and c 

26) In series combination_____ is constant.

a) potential difference 

b) current 

c) internal resistance 

d) total resistance

27) In parallel combination____ is split up.

a) current  b) potential difference c) temperature d) pressure 

28) For battery conductivity ____combination of resistance is preferred.

a) series 

b) complicated 

c) parallel 

d) unique 

29) one watt-hour is equals to :

a) 36J b) 360 J c) 3600 J d) 36000 J

30) An electric bulb is rated 100W, 220V. The resistance of the filament of the bulb when it is glowing is:

a) 2.2Ω b) 0.45Ω c)  45.45 Ω d) 484 Ω

31) 1 megawatt is equals to :

a) 10⁻³W b) 10³W c) 10⁻⁶W d) 10⁶ W

32) Which of the following expression is incorrect for electrical energy ?

a) QV b) VI c) I²Rt d) V²t/R

33) The rating of a fan is 80W, 250V.  The current flowing through it is :

a) 0.32A b) 3.12A c) 25.6 A d) none

Question Paper 1

Time 30 minutes.     Marks: 20M

Section 1 

(All questions are compulsory)

1a) Differentiate between conductance and resistance of a wire.     2

b) A refrigerator is marked 80 W and 220V. How much energy does it consuming in one day if on an average it is used for 20 hours per day ?      2

c) Calculate the value of resistance which must be connected to 15Ω resistance to provide an effective resistance of 6 Ω.        2

d) State Ohm's kaw as applicable to ohmic conductors?     2

e) An electric circuit has its key open as a result in an open circuit. Is the value of resistance offered by the zero or infinite. Justify?     2

Section 2

(Attempt any one question out of two)

2a) Calculate the equivalent resistance between terminal A and B in the following circuit diagram:       4

b) An architect's studio has following appliances run on an average for 8 hours per day.  5 CFL tubes of 30W each , 3 Aircons on 75 W each, one coffee blender of 15 W and 1 overhead projector of 2.5 HP. Find the cost of electricity bill in the month of April if cost of electricity is 1.50 per KVAh. (Given 1 H. P= 750W).    3

c) Give reasons for the following:        3

a) electricians are used rubber gloves while handling electric wiring system.

b) Thick wires used in the heads of an electric radiator ?      

3) a) State Four points of difference between electromotive force and potential difference.       4

b) 30 bulbs are connected in series. if one bulb is fused and the remaining 29 are again reconnected in series. Will the light increase or decrease in the room? justify.    3

c) An electric bulb is rated 100W, 250V. What does this statement imply ? also calculate the current the bulb would draw if connected to a 250V supply?      3

SHORT QUESTIONS (SCIENCE)- X

BIOLOGY 

1) The foetus draws its oxygen from the ____ (amniotic fluid, placenta, umbilical cord) 

2) The condition of a cell when it cannot accommodate any more water is ____(turgor pressure/ turgid/ flaccid). 

3) The blood vessel which carries oxygenated blood to the heart is ____ (aorta, pulmonary vein/ pulmonary artery).

4) The respiratory centre is located in the ____ (cerebrum/hypothalamus/ medulla oblongota).

5) Myopia can be corrected by ____(convex lens/ concave lens/ surgery).

6) The duct which leads from the epididymis to the urethra is the ____. 

7) The swelling on a nerve in which the cell bodies of neurones are situated is termed ____. 

8) The embryo in the uterus is protected from machanical shocks or jerks by the ____.

9) ATP stands for _____

10) Light enters the eye through the aperture called ____.

11) The liquid portion of the blood is___. 

12) ____ is a pigment in mammalian body which is responsible for the transport of oxygen. 

13) Nucleated blood cells are called ___.

14) A protein called an ____ destroys harmful injective micro-organisms. 

15) A protein called ___ is ingredient in the clotting reaction of the blood. 

16) Fill the blanks by given words:( osmosis, ciliary muscles, aorta, stapes, alveoli, WHO, malleus, diffusion, dorsal aorta, bronchioles, iris, red cross, cardiac cycle, ventilation, iron, iodine, liver, kidney) 

a) The blood vessel leaving the left ventricle of the mammalian heart is the ____. 

b) The process by which molecules distribute themselves evenly within the space they occupy is termed _____.

c) The sequence of muscular movements performed by the heart is called ___. 

d) Goitre results from the deficiency of ___ in our diet. 

e) Urea is produced in the ____. 

17) Each kidney is composed of ___. 

18) The process of removing the metabolic waste from the body is known as ____. 

19) ____ is the structure, which carries urine from kidney to the urinary bladder. 

20) Apart from urea ____ is also found in normal human urine. 

21) Automatic self regulation of salt and water within the body is known as ____.

22) The defect of hypermetropia is corrected by ____. 

23) In spinal cord ____ is inside. 

24) "Green house effect" is due to increase in amount of ___ in the atmosphere. 

25) The _____ are the ones which are between the ends of sensory neuron.

26) The storage of sugar as glycogen in the liver is increased by the presence of ____. 

27) The valve present between the left atrium and the left ventricle is the ____.

28) Food is translocated in plants through___. 

29) The average life of RBC is ____. 

30) Receptor cells in the eye concerned with colour vision. 

31) The part of the nervous system which prepares the body of an emergency. 

32) The stage of mitosis during which chromatids and move apart. 

33) The process of getting rid of the waste products of metabolism is called___. 

34) One of the products formed by the___ of water is oxygen. 

35) The blood vessel which transport blood from the heart to an organ is called___. 

36) The cell in which oxyhemoglobin is formed is____. 

37) The level of health in India is low due to___ and____. 

38) In India life expectancy in____ is lower than in males because of causes associated with____. 

39) The yellow fluids which remain after blood has clotted is termed ____.

40) ____ is the force developed during Osmosis (turgor pressure/diffusion pressure deficit/osmotic pressure).

41) Flaccid and turgid ____(opposite/ same/ not related) to each other. 

42) ____ is an organ which serve as a blood reservoir during emergency (spleen /lumg/ heart). 

43) pH of blood is_____( 7.3 to 7.5/ 7 to 8/ 6.5 to 7). 

44) Potometer is an instrument for measuring the rate of___ ( transpiration/ photosynthesis/ flow of blood in an artery). 

45) WBC's count is higher in _____(adults/children/ middle aged persons).

46) Largest region of the brain is____ ( Cerebellum/ cerebrum/ medulla). 

47) The basic unit of the human brain is the____.

48) The end product of the fermentation is___. 

49) A non degradable pollutant is____. 

50) The period of the complete development of the foetus till birth is termed ____. 

51) The foetus draws its oxygen from the___ (ammonia fluid/ placenta/umbilical cord). 

52) The condition of a cell when it cannot accommodate any more of water is___( turgor pressure/ turgid/ Flaccid).  

53) The respiratory Centre is located in the ____.(cerebrum/ hypothalamus/ medulla oblongota).

54) The function of root is____(secretion/absorption/sinthesis). 

55) colour blindness is a____. ( mistake/ genetic disorder/ infectious disease). 

56) The modified Golgi complex in a sperm is ____. (tail/end piece /acrosome ). 

57) Largest pregnancy seen in a mammal is in the____.( Asiatic elephant/Asiatic lion/ tiger).

58) Placenta has____( 50% maternal component/ 50% paternal component/ no maternal component). 

59) Cell division in plants take place by____. (centrosome/ microtubules/ vesicles ).

60) Diabetes mellitus is caused due to____ of insulin. ( hyposecration/hypersecretion/ normal separation). 

61) All animals would die on Earth if there was no____ (hemoglobin/ chlorophyll/ penicillin).

62) ____:is a genetic disorder. (Thalassemia/typhoid/cholera).

63) Deficiency of growth hormone causes____(gigantism /achromegaly/ dwarfism).

64) Guttation occurs through____. (Hydathode / lenticel/cuticle).

65) _____ is a cross between F₁ (individual and any of the two parents. (Test cross /back cross/ simple cross).

66) ___genetic disorder(Cholera/ typhoid/colour blindness). 

67) Mendel's ____ is often known as purity of gamets . 

68) ___' is a 5-carbon compound formed in light reaction and enters into the dark reaction. (PGA/ RUDP/NADPH₂). 

69) 'Fight' and 'Flight' harmone is_____.(adrenaline/insulin/glucagon).

70) The energy-rich compound is_____( ADP/ATP/NADPH₂).

CHEMISTRY 

1) From the following list of substances choose the one substance in each case which matches the description (i) to (vi) given below.

 ---Write down the names exactly as they are given in the list.-- Do not write formulae.

(Ammonium nitrate, calcium hydrogen carbonate, copper carbonate, lead carbonate, Lead Nitrate, potassium nitrate, sodium carbonate, sodium hydrogen carbonate, zinc carbonate)

i) A hydrogen carbonate which exists in the solid state. 

ii) A carbonate not decomposed by heat.

iii) A green coloured carbonate which turns black on heating.

iv) A nitrate which gives off only oxygen when heated. 

v) A nitrate which on heating decomposes into dinitrogen oxide (nitrous oxide)

 and steam.

vi) A nitrate which gives off Oxygen and Nitrogen dioxide when heated. 

2) Choose from the following list of substances, the one substance in each case, which matches the descriptions (i) to (x) given below:

( Write down the names exactly as they are given in the list. Do not write symbols or formulae. Note there are three extra names)

 Aluminium nitride, brass, bronze, chlorine, copper hydrogen sulphide, magnesium, Methane, methanol, Sodium hydrogen sulphate, sulphur, Sulphur dioxide, zinc.

i) The molecules of this compound are non-polar. 

ii) This metal does not liberate hydrogen from dilute acids. 

iii) This compound is an acid salt.

iv) This metal reacts with sodium hydroxide solution liberating hydrogen. 

v) This compound reacts with water and liberates ammonia. 

vi) This gas when dissolved in water reacts to form two acids. 

vii) This non-metallic elements exists in two crystalline forms in the solid state.

viii) This substances is an alloy of Copper and zinc. 

ix) Spurious liquor contains this compound. 

x) This gas turns moist lead acetate paper black.

3) From the substances manganese (IV) oxide, hydrochloric acid, lead(IV) oxide, magnesium , Phosphorus, sodium , select 

i) One which evolves oxygen on heating.

ii) two substances which react with each other in cold to give hydrogen.

iii) a substance which will burn in oxygen giving a product that reacts with water so that on the addition of litmus it turns blue. 

iv) A substance which will burn in oxygen to produce an acidic oxide. 

v) two substance that will react with each other to produce chlorine. 

4) Choose from the following list of substances, the one substance in each case which matches the descriptions (i) to (x) given below:

(Write down the names exactly as they are given the list. Do not write symbols of formulae. (Note : there are three extra names)

bronze, carbon disulphide, calcium carbide, ethyl alcohol, slaked lime, sulphur trioxide, Ammonium Nitrate, sodium, sulphate, ammonium carbonate, Phosphorus, methane

i) A gas is evolved when Sodium acetate is heated with soda lime. 

ii) A non-metallic element exists in two crystalline forms . 

iii) A silvery white soft metal which is kept in kerosene oil. 

iv) A substance on heating produces laughing gas.

v) A gas dissolves in water with a hissing noise and produces an acid moist. 

vi) A white alkaline substance which on mixing with ammonium chloride and heating evolves ammonia. 

vii) An alloy for making statues and coins. 

vii) A solvent for dissolving Sulphur. 

ix) A substance when treated with water liberates acetylene. 

x) An alcohol generally used for drinking purposes. 

5) X is an element in the form of powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:

a) if X is a metal, then the litmus will turn____. 

b) if X is a non-metal, then the litmus will turn____. 

c) If X is a reactive metal then____ will be evolved when X reacts with dilute sulphuric acid. 

d) if X is a metal it will form ____ which will form____ solution with water. 

 

e) If X is a non-metal, it will not conduct electricity unless it is carbon in the form of ____. 

6)a) Ionic compounds have ___ melting points due___ ionic bonds.(high/ low/ strong/ weak). 

b) ____ compounds have low boiling points because of ____intermolecular forces . ( electrovalent/covalent/strong/ weak). 

c) A solution of a ____electrolyte will contain both ions and molecules of the solute. (strong/ weak).

7) (anions, anode, cathode, cations , electrodes, electrolyte, nickel, voltmeter)

a) To electroplate an article with nickel requires an___ which must be a solution containing____ ions. The articles to be plated in a placed as the___ of the cells in which the plating carried out. The ____of the cell is made from pure nickel . The anions which are attracted to the negative electrode and discharged of called____.

8) a) A chemical linkage formed between two dissimilar atoms by the___ of electrons from one atom to the other is called____ linkage. (electrovalent/covalent/ transference /sharing). 

b) The tendency of an atom to____shared pair of electron towards itself in a covalently bonded molecule is called___(ionization energy/ electronegativity/ attract/repel). 

c) The hardness of ionic compounds is due to___ the electrostatic forces of attraction between___ charged ions(weak/ strong/ oppositely /similar). 

Physics 

1) State the SI and CGS unit of force.

2) Define critical angle.

  

3) Define erg.

4) What is meant by Refractive index of a medium with respect to air ?

       

5) State two uses of ray having frequency less tha

n that a visible light.

     

6) If a crowbar has length 1.5m and the fulcrum is placed at 25 cm from one end, find its MA.

     

7) What is meant by the spectrum of white light ?

8) What is thermionic emission ?

9) Define specific latent heat of steam.        

10) What is an echo?

11) Define the term resonance.

12) On what factor does the natural period of a body depend .

13) A car driver parks his car with two 60 W headlamps and four 6W sidelamps switched on. The lamps are connected in parallel and powered by 12 V battery.

Explain the phrase connected in parallel.

14) Define resistivity of the material of a conductor.

       

15) On what factor does the resistivity depend ?

16) State Snell's law.

17) Define the SI unit for the power of a lens.

18) Under what condition does resonance occur ?

19) Why is a loud sound heard at acaustic resonance ?

20) State the principle of moments as applied to a lever.

21) Define specific latent heat of ice.

22) State the principle on which lever works.

23) Complete the equation ¹³¹₅₅I ---> X + ⁰₋₁e.

24) Name the material used for making a fuse wire. 

25) With reference to a DC motor state the energy change that takes place.

26) With reference to a DC motor, the principle upon which it operates.

27) A radioactive element ᴬₓX first emits a β-particle and then an Alpha particle and the resulting nucleus can be represented by ᴾqY. What is the value of P and q in terms of A and x ?

28) What is a nuclear fusion?

29) What purpose does a fuse serve in a circuit?

30) What is resonance?

31) Give the conditions under which resonance occurs.

32) Give one example of the phenomenon based on resonance.

    

33) Define 1 Ohm.

34) Among the α, β and γ-ray, which one has least penetrating power? 

35) You have just paid the electricity bill for your house.

a) What was it that your family consumed, for which you have to pay ?

b) In what unit was it measured ?

36) Water in a pond appears to be only three quarters of its actual depth. What property of light is responsible for the observation ?

Biology     

1) The gland is secretes insulin

.

2) The part of the brain which is concerned with memory.    

3) The kind of cells which constitute the cortex in a root.  

4) The biggest source of air pollution in largest cities.   

5) An artery which carries deoxygenated blood.   

6) The type of vascular bundle in Dicot root. 

7) The kind of leaf in which the mesophyll is differentiated into upper palisade and lower spongy parts.    

8) The instrument used to measure the rate of transpiration.   

9) The duct which transports urine from the kidney to the urinary bladder.   

10) The endocrine gland which produces emergency hormone.  

11) The sheet of muscle between the thorax and abdomen of man.   

12) The fluid that is present inside and outside the brain.     

13) The opening through which light enters the eyes.       

14) The element required for clotting of blood in man.     

15) The tube that leads from the ovary to the uretus.     

16) Tissue concerned with upward conduction of water in plants. 

17) Opening found on the under-surface of Dorsiventral leaves.  

18) The technical term used for the difference between birth rate and the death rate.  

19) The cells that controls the entry of carbon dioxide into a leaf.  

20) The constituent of blood destroyed in the liver. 

21) The amoeboid cells in the human body.    

22) Female reproductive cells (human).      

23) The point in which one neurons end and other starts.    

24) The gland which pour their secretions directly into blood.  

25)  A metal causing water pollution. 

26) The organ of the female body in which the foetus develops.   

27) The phase of the cardiac cycle in which ventricle ejaculates blood to the outer aorta and pulmonary artery.          

28) The site of production of the red blood cells in the adult humans .    

29) The source of maximum air pollution in larger cities.    

30) The process in which WBCs engulf bacteria.     

31) A condition caused due to oversecretion of thyroxine.       

32) Receptor cells in the eye concerned with the color vision.   

33) The part of the nervous system which prepared the body of an emergency.     

34) The stage of mitosis during which the chromatids separate and move apart.     

35) A bilobed gland situated in front of the neck just below the larynx .  

36) The organ in which adrenal gland or suprarena gland is located.   

37) The hormone that controls the basal metabolic rate.    

38) The duct which transports urine from the kidney to the urinary bladder.   

39) The soluble protein present in blood plasma, responsible for clotting.    

40) The surgical method of contraception of human female.   

41) A pollutant which reduces the oxygen carrying capacity of blood.     

42) A tissue present at the tip of the root .   

43) The bony socket in which eye is well protected.     

44) The colour of rays and which photosynthesis is highest.  

45) An artery which carries deoxygenated blood.    

46) The site of production of RBCs in the human embryo.      

47) The structure that joins the two cerebral hemispheres.    

48) A pollutant largely responsible for Acid rain.     

49) A fluid that transports fatty acid and glycerol.       

50) Cytoplasmic organelles that helps in the manufacture of starch.      

51) The statistical study of human population.    

52) Pair of genes responsible for a particular characteristic in an individual.   

53) A solution whose concentration is greater than that of the cell sap.      

54) The fluid that provides protection and nourishment to the cell of the brain.     

55) The gland which secrets insulin.      

56) The part of the brain which concerned with memory.      

57) The cross in which only one pair of character is considered.   

58) Sex-limited genes.      

59) The exudation of sap from the injured parts of the plants.     

60) A fully stretched cell.     

61) The term used for mature follicle in females.        

62) Raw materials of photosynthesis.       

63) Condition reflexes are controlled by this part.      

64) Two giant chromosomes.     

65) The middle coat of the eye.       

66) The method of cutting spermatic ducts in males .    

67) Glands which possess a duct to pour their secretions.      

68) Aggregation of nerve cell bodies.        

69) A change of activity due to stimulus.        

70) The inner most layer of brain.         

71) The place of fertilization of eg cell in humans.      

72) Time when stomata are generally closed.        

73) A special marginal structure in a leaf through which guttation occurs.    

74) Disc shaped structure found in centrome.      

75) Inactive X chromosomes.      

76) Progenies produced asa result of sexual reproduction between two varieties.    

77) The giant chromosome discovered by the Italian scientist Balbbiani.      

78) The nitrogenous bases which is not present in DNA.  

79) Deficiency disease of vitamin A.    

80) A. process of transferring of sperm into r female uterus by artificial means.    

81) The three conditions for photosynthesis to occur.      

82) A structure in the ovary carrying a centrally placed ovum surrounded by cerebral layers of granular cells.     

83) A fluid which acts as a shock-proof cushion for the brain and spinal cord and keeps them moist.      

84) A gland consisting of two lobes, placed on either side of trahea in the neck region .         

85) A hormone which helps inconserving body water.  

86) The study of nervous system in animal body.  

87) The hormone secreted by delta cells of pancreas.     

88) thre actions which are involuntary controlled by spinal cord.    

89) The pouch in which testes are present in man.     

90) A system which includes the nerves which carries the impulses to and from the central nervous system.   

91) Dark reaction in photosynthes.      

92) The factor which stimulates the function of thyroid.  

93) A psychological phenomenon which causes premature leaf fall and delay in flower production due to the production of Abscisic acid.     

94) A process which regulates opening and closing of stomata.     

95) The chemical used to denature chlorophyll in green leaves for discharging it.   

96) The most affected part of the brain after alcohol consumption.   

97) A deformality of the body which result in abnormal long bones of lower jaw but the body does not attain a giant structure.     

97) A structure in the nervous system which involves reflex actions .    

98) The gland present in the eyes.       

99) The gland which is often called master gland.       

100) The cell division also known as reduction divisio.    

101) The endocrine gland present only in females.       

102) Large plyhedral cells in the connective tissue of the testis which produce male sex hormone.     

POPULATION

A) Definition 

1) Population 

2) Population density

3) Demography

4) Population dynamics

5) Birth rate or natality

6) Mortality

7) Fertility rate

8) Population growth

9) Growth rate

10) Write the main reasons contributing to the population grows 

11) The main reasons for high birth rate :

12) Family planning or birth control 

13) The scientific methods of birth control are:

14) Tubectomy (in females) 

15) Vasoctamy (in males) 

16) Laparoscopy.

17) Mass media

18) population education

19) Sex ratio 

20) Age ratio 

21) Physical enumeration

22) Growth rate of population

23) Population explosion 

24) Overpopulation

B) FILL IN THE BLANKS:

a) The major causes of population explosion in India is____.  (early marriage/ late marriage)

b) The scientific study of population is called_____.   ( birth rate/demography)

c) Minimum age of marriage for boys is___ and for girls____ years.  (21/25/ 18/ 23)

d) The popular sign of family planning in India is___. ( inverted triangle/ inverted blue triangle)

e) The addition of new only indivisuals to the population from other localities is called ___.   (Immigration/ emigration)

f) _____ is the cutting of fallopian tube in females.   (Vasoctamy/Tubectomy)

g) Number of people increases in ____progression while food production rises in ___ progression.    (geometric/arithmetic)

h) Amniocentesis is misuse for ____ tests.    (Sex/population)

i) ____' is the cutting of spermatic ducts in males. ( tobactomy/ vasactomy)

 

C) Name the following 

1) The exceptionally high rate growth of population.      

2) The total number of individuals of a species found in a particular areas, continent of whole Earth.   

3) Two renewable sources for mankind.   

4) Two nonrenewable sources for mankind.    

5) Changes that occur in population due to alteration in mortality, sex ratio , age groups etc.,   

6) The actual birth rate that occurs under the existing condition.   

7) The actual number of deaths in the existing condition.    

8) The method of contraception which involves determination of the women's safe period.     

9) A rubber device placed over the cervix to prevent conception.   

10) The technical term used for the difference between the birth rate and the death rate in a population.  

11) The number of individuals per unit area.   

12) The term for the statistical study of the human population 

oR

 The scientific study of human population.   

13) Two surgical techniques (one each for human male and female) that can be used to prevent pregnancy.   

14) Mutually beneficial association of two living organisms.   

D) Match the column 

Column A 

i) Demography 

ii) contraceptives 

iii) birth rate 

iv) Tubectomy 

v) abortion 

vi) mortality

Column B 

a) is the number of deaths in a specified period of time.

b) sterilization in females 

c) scientific study of population

d) termination of pregnancy

e) prevent ovulation in females

f) naatality 

 

D) VERY SHORT QUESTIONS 

1) Name some patterns of population distribution.

2) Why has growth rate increased in India despite fall in the birth rate ?

3) What is the present rate of growth of population of the world and of our country ?

4) What is emigration ?

5) What is meant by realised natality and the realised mortality?

6) What are growth curves and what do they signify ?

7) List three major landmarks in human history which contributed to sudden rise in the population of the world.

8) How much is the population density of India ?

9) What was the approximate Indian population according to the 1981 census ? What was it in 2001 ?

10) What is carrying capacity ? List some factors which determine in it.

11) Sterilization in men means preventing the flow of sperms into the seminal vesicles by cutting or ligaturing the vas deferns. Can there be corresponding operation made in woman ? if yes, where ?

12) What is meant by the family welfare centres ? What is the sign of Family Welfare in our country ?

13) Suggest some methods of fertility control in men.

14) What is the meaning of the term 'growth rate of the population'? In what situations can be negative ?

15) What are the problems created by ultimate growth of human population in urban areas ?

16) List four major disadvantages of having large families.

17) What is the emblem (sign)) of family planning and Family Welfare in India ?

18) Which is the most thickly populated state in India ?

19) List three important aspects of demography.

20) Suggest any three steps which may be taken towards controlling the rapid rise in human population in India.

21) Expand the term IUD 

22) Write the full form of MTP 

23) Choose the odd one and give a reason for your answer

Spermicide, Condom , intra-uterine device, Fungicide 

24) How is electronic media education people about the importance of small families?

25) Name any two renewable and two non-renewable resources for mankind.

26) State whether the following statements are true or false. Rewrite the wrong statements by changing only one word:

a) birth rate is the number of live births per 100 of population per year.

b) fossil fuels are renewable resources .

c) use of condom for contraception is a barrier method.

27) Explain briefly that the need to limit the size of the family is more vital today than ever before. Give two reasons.

28) Differentiate between Vasectomy and Tubectomy (parts operated)

29) Explain briefly the following term : death rate.

30) What are the age restrictions for the marriages by law for boys and girls in India ?

31) What do you understand by the density of population?

32) Name two surgical techniques (one each for human male and the female) that are used to prevent pregnancy.

33) define birth rate 

34) Mention any four reasons for the rapid increase of population in India in recent times.

35) Give the appropriate term for the following:

 The surgical method of sterilization in the human female.

36) State whether the following statement is true or false. If false , write the correct statement by changing the incorrect word or words only.

Mortality is the number of deaths per thousand of the population per decade..

37)  List the reason for the population explosion

OR

 Mention two reasons for the high birth rate in India.

38) Given below is an incomplete explanation of certain biological process/ term where a key word has been left out. Rewrite the completeed explanation by inserting the key word in the space indicating by ' '

Birth rate is the number of  ' ' births per thousand of the population per year.

39) Mention three main reasons for the sharp rise in "Human population" in the world.

E) Choose the correct answer 

1) Sterilization in males involves cutting and tying of:

a) ureter  b) urethra c) vas deferns d) epididymis 

2) The contraceptive method which is least reliable:

a) withdrawal b) diaphragm c) IUD d) condom

3) The contraceptive method which is most reliable :

a) diaphragm b) IUD c) withdrawl  d) contraceptive pill 

4) thre contraceptive method which is a barrier method used to by the male :

a) IUD b) withdrawal  c) hormonal pills d) condom

5)  sterilization in females involves cutting and tying the:

a) ureter  b) uterus c) Urethra d) oviduct

F) Observe the diagrams A and B given below:

a) level partr 1-5 

b) what does diagram A depict ?

c) what does diagram B depict ?

d) comment on X and Y.

e) state one function each of part 2 and 4.

Life science - X T.2

TEST PAPER -2

Time: 3hrs 15 mins.      Full Marks: 90

Group -A

(Answer to all questions is compulsory)

1) Write the answer in complete sentence by choosing the correct answer for each question will respected serial number:           (1x 15= 15)

 

a) The gland which according to you is a known as Master gland is

i) pituitary ii) adrenal iii) pancreas iv) thyroid 

b) Which of the following breaks dormancy and causes germination of seed

i) auxin  ii) gibberlin iii) cytokinin iv) Ethylene 

c) Select from the following the number of cranial nerves present in human beings.

i) 10 pairs ii) 12 pairs iii) 24 pairs  iv) 31 pairs 

d) The name of the sugar present in DNA is 

i) ribos ii) pentose iii) Deoxyribose iv) glucose 

e) The type of asexual reproduction found in Planaria is

i) fragmentation ii) spore production iii) regeneration iv) budding 

f) A person is passing through the period between childhood and maturity. Choose the time period he is passing through

i) 10 -19 years  ii) 15- 25 years iii) 13- 19 years iv) 25 -35 years

g) He performed experiments on heredity and is known as father of genetics. He is 

i) Lamarck ii) Darwin iii) Mendel  iv) Johansen 

h) Deduce the types of gametes that could be formed from YyRr

i)  three types ii) 4 types iii) 5 types iv) 2 types 

i) A boy can roll his tongue while another boy cannot. They are each other 

i) variation  ii) locus iii) character iv) genotype

j) Identify the oldest fossil of horse from the following --

i) Pliohippus ii) Merychippus iii) Mesohippus iv) Eohippus 

k) The organ present in fish that helps in maintain buoyancy is

i) Gill ii) Swim bladder iii) Tailfin iv) Thoracic fin

l) The theory 'Struggle for existence' was proposed by 

i) Lamarck ii) Hugo-De-Vvris iii) Weissman iv) Darwin 

m) The nitrogen fixing bacteria which is present symbiotically in the root of leguminous plant is 

i) azotobacter ii) Clostridium iii) rhizobium iv) Nitrobacter 

n) You have visited hotspot in India where you findnone-horned rhino, you have visited

i) Sundaland ii) Westernghat and Sri Lanka iii) Indo-Burma iv) Eastern Himalayas 

o) The chemical used in cryoopreservation is 

i) liquid oxygen ii) liquid nitrogen iii) liquid carbon dioxide  iv) liquid Methane 

Group B 

2) Answer any 21 questions out of 26 questions given below as instructed.  1x21=21

Fill in the blanks with proper words in the following sentence (any five ):  1x5=5

a) The three layer layered covering of human brain is called____

b) The unit of asexual reproduction of human brain is called ____

c) The importance of ____ chromosome is maximum to determine the sex of human beings.

d) The theory of origin of new organ to meet the demand is the opinion put forward by ___

e) ____ is a disease you will find in an area suffering from water pollution.

f) The Asian Lion can be found in the ____sanctuary of Gujarat.

 Decide whether the following statements are true or false (any five) 1x5=5

g) Insufficient release of STH can make a child dwarf.

h) In cross pollination there is no need of carrier.

i) When a pure tall and a pure dwarf plant are crossed then the offspring produced is a hybrid.

j) Cactus could survive without water at a stretc in the hot desert conditions.

k) Chewing of tobacco can lead of asthma .

l) A high intensed sound can cause damage to our digestive tract.

Match the words in column A with those which are most appropriate in column B and rewrite the correct pair mentioning the serial number of both the columns (only 5): 5x1=5

Column A 

j) Amoeba 

k) DNA 

l) incomplete dominance 

m) bee dance 

n) Greenhouse gas 

o). meiotic cell division 

Column B 

i) carbon dioxide 

ii) Pseudopodia 

iii) evening Glory 

iv) crossing over 

v) communication 

vi) Singalila 

vii) Double stranded 

Answer in a single word or in a single sentences (any six): 1x6=6

p) Choose the odd one and write it :

Oxytocin, Prolactin, Follicle, Stimulating Hormone , Luteinising Hormone .

q) "A plant hormone acts as chemical messenger. "  Explain the statement.

r) A pair of related terms is given below. On the basis of the relationship in the first pair write the suitable word in the gap of the second pair.

Planeria : regeneration : : Yeast : ___

s) In guinea pig, black fur is dominant over white fur. Suggest what would be the probable genotype of a white guinea pig.

t) Deduce what happens when male gamete (22A + X) fuses with female gamete.

u) Name the organ whose origin are same but they function differently.

v) There is a industry near a locality sending our smoke. Write the name of a disease that can spread in the locality because of it.

w) An alkaloids obtained from a particular plant is used to reduce the high blood pressure.

Group - C

3) Answer any 12 question in 2-3 sentences out of 17 questions given below.  2x12= 24

a)  You are concentrating open your studies when suddenly an intense torch light flashes upon your eyes. Explain your reaction and the mechanism behind it.

b)Discuss about the pituitary gland on the basis of the following points

  i)  location  ii) two measure divisions

c) A bird is flying in the sky. Explain how its feathers , the remiges and the rectrices , are helping in its action.

d) Why does a plant acquire bushy appearance when its terminal end is nipped off regularly ? Explain this with the role of plant hormone.

e)  Differentiate between sexual and asexual reproduction on the basis of the following points.

    i)  number of parental organism required

   ii)  nature offsprings produced

f) Justify what may happen if the cell cycle does not take place properly.

g)  Why is alteration of generation important in ferns?

h) You are given a tall pea plant bearing violet flowers . Deduce the probable genotype of the pea plant.

i) With the help of a cross calculate the percentage of normal children produced from a colour blind carrier mother and normal father.

j) Recall and write the phenotype and genotypic ratio F₂ generation of a cross between a pure yellow round seeded pea plant with a pure green wrinkled seeded pea plant 

k) Discuss the role of air sac in the adaptation of pigeon .

l) Recall the names of the gases used in Miller and Urey's experiment and write down the ratio in which they are used.

m) Justify with two reasons how modern horse has gradually evolved from its forerunners.

n) Why is ammonification considered to be an important stage in nitrogen cycle ?

o) Why is Sundarban called a biosphere reserve ?

p) Write two problems due to population explosion in your city.

q) Write two difference between in-situ and ex-situ conservation on the basis of

    i) place of conservation 

    ii) access of public 

Group - D

Write the six questions or their alternatives given below. The mark alloted for each question is 5 (the division of mark is either 3 + 2, 2 + 3 or 5):

 

4) Answer 6 questions or there alternatives given below:       5x6=30

 a) Draw this structural and functional unit of nervous system and lebel  3+2=5

   i) Dendron ii) Node of Ranvier iii) Schwann cells iv) Axon Hillock 

OR

Draw a anaphase stage of animal cell division and label the following parts -

   i) Centrosome ii) Chromosomal spindle fibre iii) Continuous spindle fibre iv) Chromatid 

b) A baby is born a few days ago. Discuss the phases of growth taking place in its body. Mention which part of a flower develops into a fruit and which part into seed after fertilization takes place.          3+2=5

OR

You have brought a rose twig from your friend's house and planted it in your garden. Discuss the method you have adopted and why ? How will you differentiate between the cell division of a somatic cell and a reproductive mother cell on the basis of -

  i) nature of the chromosome division 

  ii) number of daughter cell produced.

 

c) With the help of a checker board and showing cross upto F₂ generation exemplify how Mendel deduce his first law. State the law.         3+2=5

OR

 Differentiate between Thalassemia and haemophilia on the basis of the following points -

  i) type of chromosome affected 

  ii) symptom

 Discuss what should be done to prevent birth of more children suffering from genetic diseases and how can you do it ?

d) How does camel resist dehydration in the desert condition ? Discuss the psychological adaptation of Sundari in the salt water condition.

OR

Discuss how wings of bat and birds indicate convergent evolution. There is a garbage dumping station at a place. Discuss what types of struggle for existence you may find there.         3+2=5

e) What is the need of conservation in today's world ? you have recently visited a sanctuary. Write two characteristics features you find typical to it.   3+2=5

OR

You live near the airport area. Deduce what pollution you face everyday and what are its effect on your body.

f) What criteria should you take into account to declare a place a hotspot ? you have been invited to deliver a speech in an awareness programme on Lung cancer. Discuss what you must include in your speech.     3+2=5

OR

List up the reasons behind the reduction in number of tigers in a forest. What steps should you take to overcome this ?

TEST PAPER - 2

SECTION - I (40 Marks)

(Compulsory: To be attempted by all candidates)

Question 1:

a) Name the following:

i) The cell organelle responsible for protein synthesis.

ii) An artery which carries deoxygenated blood.

iii) The type of vascular bundle in Dicot root.

iv) The kind of leaf in which the mesophyll is differentiated into upper palisade and lower spongy parts.

v) The instrument used to measure the rate of transpiration.    (5)

b) Complete the following pairs to represent the relationship between the structure and the special functional activity:

i) White blood cell and _______

ii) Palisade cells of leaf_____

iii) ______ and translocation of food.

iv) _____ and transference of impulse from human eye to the brain.

v) Testis and _____.           (5)

c) Complete the following statements by filling in the appropriate term. Rewrite the complete statements.

i) The duct which leads from the epidermis to the urethra is the ____.

ii) The swelling on a nerve in which the cell bodies of neurons are situated is termed _____

iii) The embryo in the uterus is protected from mechanical shocks or jerks by the___

iv) ATP stands for____

v) Light enters the eye through the aperture called____.       (4)

d) The first pair in the following list indicates the kind of relationship that exists between both the items. Rewrite and complete and second pair on the similar basis :

e.g., Eye: sight:: Ear: hearing 

i) Adrenal gland; Adrenil:: Thyroid : ____

ii) light reaction: grana:: dark reaction :_____

iii) chlorophyll : magnesium :: haemoglobin: ____

iv) right ventricle : pulmonary artery ::  left ventricle : ____

v) brain: neuron::  kidney : ____.     (5)

e) Name the following cells and state where in the human body they are found:

i) living cells without nuclei.

ii) Cells that conduct electric impulses .

iii) Cells that are haploid.

iv) Cells that are sensitive to different colours.

v) Cells that act as insulating layer and also storage.     (5)

f) Name the organs in which this are located:

i)  Iris    (1)

g) Select the correct answer:    (1)

i) Haemoglobin has affinity for 

1) CO₂ 2) N₂ 3) O₂ 4) none 

h) State whether the following statements are true or false:

i) Nocturnal creatures avoid light.

ii) Image is formed one blind spot.

iii) Cranial nerves arise from the brain.

iv) Two meninges cover the brain and the spinal cord.

v) abnormal working of rods causes nightblindness.     (5)

 Section II 

(Answer any four questions from this section)

Question 2

a) On a bright sunny day water weeds growing in an aquarium were seen actively giving off bubbles of gas. Use this information to answer the questions that follow:

i) Name the process occurring in the water weed that has resulted in the evolution of these bubbles.

ii) Of what gas do these bubbles consists?

iii) Briefly describe the reactions occurring in the leaves of the water weeds, leading to the evolution of these bubbles.

iv) Give an overall balanced chemical equation to represent the process named  in (i) above.

b) The diagram given represents a kidney cut open longitudinal.

Study the same and then answer the question that follow:

i)  Name the structural and functional unit of the kidney.

ii) What is the region labelled 1 called?

What part of the above mentioned structure is found in this region?

iii) Name the part labelled 4. What is its function ?

iv) Name two nitrogenous substances that are excreted by the kidney.

Question 3

a) The diagram given represents an experimental set up to demonstration a vital psychological process.

Study the same and then answer the questions that follow:

i) Name the process.

ii) Define the above named process.

iii) What would you observe in the experimental setup after an hour?

iv) What control experiment can be set up for the above experiment?

v) Name any other substance that can be used instead of parchment paper in the above experiment.

vi) Mention two advantages of this process to plant.

b) i) Explain what is the meant by "pollution is a by-product of scientific advancement".

ii) State four measure in the control noise-pollution.

iii) Explain briefly that the balance of the nature is seriously affected by water-pollution.

iv) Which range of the loudness is painful to human ears.

Question 4

a) The figure is that of a nephron.

i) Label the parts 1 to 8.

ii) What is the liquid entering part 4 called ? Name two substances present in it that are reabsorbed in the 6.

iii) Name two substances present in the part labelled 1 which are not present in the part labelled 8.

.

b)i) Mention three reasons for the high birth rate in India.

ii)  Mention two steps taken by the government of India to control population.

iii) What are antibiotics ?  Give two examples of antibiotics.

Question 5

a) Give figure of a human foetus in the uterus.

i) level the parts marked 1 to 6.

ii) What is the function of the parts marked 6 and 4 ?

iii) Name any two substances transported by the part labelled 2 to the foetus .

iv) Name a hormone produced by the part labelled 4 

b) 'A' is the diagram of a living plant cell:

i) Label the parts 1 to 4.

ii) Draw a diagram of this cell as it would appear after being placed in a concentrated salt solution for a few minutes.

iii) Account for the change shown in the given diagram (drawn )

iv) What scientific term would you give for the cell as it appears after being placed in salt solution ?

v) Name the substance present in the part labelled 2.

Question 6

a) In order to demonstrate a particular Phenomenon , a piece of potassium permanganate crystal was placed in a beaker containing water as shown in the diagram:

i) What phenomenon was being demonstrated.

ii) Define the above named Phenomenon .

iii) Would there be any observable change in the beaker after a few minutes ? If so describe the change.

iv) Redraw the above diagram so as to show how it would appear at the end of the experiment.

v) Give examples each in 1 plants , 2 animals, where this process occurs.

                   

b) Give the difference between the following pairs on the basis of what is indicated in the brackets :

i) conditioned reflex and simple reflex (example)

ii) expired air and inspired air (% of oxygen)

iii) pleura and Pericardium (position)

iv) RBC and the WBC (structure)

Question 7

Given diagrammatic is a diagramatic section of the human brain as seen in a medium section. Study the same and then answer the questions that follow:

a) Name the part labelled 1. How are the brain cells arranged in this region ?

ii) What is the function of the part Marked 3?

iii) What type of gland is the pituitary ? Mention two characteristics of such glands.

iv) What term is used for the protective coverings of the brain?

v) The part labelled 4 is the medulla oblongota that continue as the spinal cord. Draw the transverse section of the spinal cord and label the following parts :

grey matter, white matter, spinal nerve, Central canal .

b) Answer briefly the following questions:

i) Why do xerophytes have thick cuticle ?

ii) What are biofertilizers ?

iii) What is meant by vaccination ?

iv) Why are most green leaves thin and broad ?