Attempt all questions from Section I and any four questions from Section II
The intended marks for questions or parts of questions are given in [ ].
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Question 1.
a) Name the following:
I) cytoplasmic organelles that helps in manufacture of starch.
ii)
iii) pair of genes responsible for a particular characteristics in an individual.
iv) A solution whose concentration is greater than that of the cell sap.
v) the fluid that provides protection and nourishment to the cells of the brain. (5)
b) State whether the following statements are true or false, write the correct statement by changing the incorrect word words only the number of word/s only. (5]
I)
ii)
iii) rods are responsible for reason in the dark.
iv) The dark reaction of photosynthesis light independent.
v) [5]
c) Match the items in column A with those which are most appropriate in column B. you must rewrite the matching pairs.
Column A
1. basic units of life
2. Beta cells of pancreas
3. Meiosis
4. protective covering of the brain
5. construction of the pupil of the eye
Column B
A. glucagon
B. Meninges
C. Iris
D. cell
E. insulin
F. Skin cell
G. Protoplasm
H. Sperm
I. Ciliary muscles. (5)
d) DIAGRAM OF POTOMETER
I) name the apparatus
ii) mention one limitation of this apparatus
iii) what is the function of the part marked ' reservoir'?
iv) what is the role of the air bubble in the experiment? (5)
e) In the box given below is a list of biological terms that can be used to complete statements that follows. select the appropriate term from the box and rewrite the completed statement. you may use a term only once.
( concave, neuron, lactic acid, glucose, animal waste, Gestation, nerve, ethyl alcohol, nephron, myopia, DDT, pregnancy, convex)
I) the type of lens used to correct myopia is ____
ii) the basic unit of human brain is the ____
iii) The end product of fermentation is _____
iv)
v) (5)
f) given below are the function of cell organ/structures found in living organisms. in each case, name the organs or structure that;;
I) produces testosterone
ii) is responsible for protecting the eye from sweat.
iii) transmits characteristics from parent to offspring.
iv) transport water from the soil to other parts of the plant.
v) initiates cell division. (5)
G) Explain the following term:
I) Tropic hormone
ii) guttation
iii) osmosis
iv) stereoscopic vision
v) Mutation. (5)
h) given below is a set of terms arranged in logical sequence, representing a process or a function. of these, one terms is incorrect. identify the incorrect term and replace it with the correct term. one has been done for you as an example.
Pollen Grain --> exine--> staminal Tube--> male gametes--> micropyle
incorrector term-- staminal tube. correct term-- pollen tube.
I)
ii) soil water--> root hair--> cells of cortex --> epidermis--> xylem
iii)
iv) pupil--> eye lens--> vitreous humour--> fovea--> auditory nerve.
iv) Sensory nerve--> dorsal root ganglion -->sensory neurone--> motor neurone -->receptor. (5)
SECTION II (40 MARKS)
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Attempt any four questions from this section
Question 2.
a) differentiate between the following on the basis of what is given in the brackets.
I)
ii)Karyokinesis and Cytokinesis ( explain the terms)
iii)
iv) mitosis and Meiosis (number of daughter cells formed)
v) pure and hybrid strains(definition). (5)
b) Diagramatic question. (5)
Question 3
a) Answer the following questions briefly:
I)
ii)
iii)
iv). (5)
b) Diagramatic question. (5)
Question 4.
a)I) Draw a neat and well labelled diagram of the chloroplast.
ii) list the events taking place in the photochemical phase of photosynthesis.
iii) If you are planning an experiment to show the effect of light on photosynthesis :
1) will you select white light or green light ? justify your answer
2) why would you select a destarched plant. (5)
b)I)explain the term reflex action.
ii) Expand the following biological Abbreviations
1) DNA 2) AIDS
iii) State whether the following actions are voluntary action, simple reflex or conditioned reflex:
1) blinking
2) cleaning the table
3) playing on the keyboard
4) salivating when food is put into the mouth. (5)
Question 5:
a) Diagramatic question on eye
I)
ii)
iii)
iv). (5)
b) Name the hormone which lead to the following conditions:
I) Diabetes mellitus
ii) growth of beard in women
iii) myxoedema
iv) Gignatism
v) exophthalmic Goitre. (5)
Question 6)
a) Diagramatic question. (5)
b)I) State mendel's Law of independent assortment.
ii) A homozygous Tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous Dwarf plant(t) bearing white flowers (r)
1. give the genotype and phenotype of the F' generation.
2. give the possible combinations of the gametes that can be obtained the F' hybrid.
3. Give the dihybrid ratio and the phenotype of the offspring of the F" generation when two plants of the F' generation above are crossed. (5)
Question 7)
a) The Diagramatic question of mitotic cell division. (5)
b) Give reason for the following:
I) plants begins to die when excess of soluble fertilizers are added to the soil.
ii) Injury to the medulla oblongata results in death.
iii) Gametes have a haploid number of chromosomes.
iv) Green leaves are thin and broad.
v) Lysosomes are termed suicidal bags of a cell. (5)
