SEED

DEFINITION:

a) Albuminous seed (Endoplasmic seed)

*b) Aleurone layer

*c) Caruncle

*d) Caryopsis

*e) Coleoptile

*f) Coleorrhize

g) Cotyledons(seed leeves)

*h) Dormancy

*i) Dormant seed

j) Embryo

*k) Embryonic axis(tigellum)

l) Endosperm

m) Epicotyl

n) Epigeal germination

o) Exalbuminous seed (non-endospermic seed)

p) Hilum

q) Hypocotyl

r) Hypogeal germination

*s) Mangrove plants

t) Micropyle

u) Plumule

v) Radicle

*w) Raphe

x) Seed

z) Seed coat

*a) Scutellum

b) Tegmen

c) Testa

d) Vivipary

QUESTIONS:

1) What conditions are essential for seed germination? Describe their importance.

2) How would you demonstrate that oxygen, water, temperature are necessary for seed to germinate ?

3) Why does a farmer plough his field and makes soil loose before sowing seeds?

DIFFERENTIATE

1) Epicotyl/Hypocotyl

2) Radicle/Plumule

*3) Coleorrhize/ Coleoptile

4) Bean seed/ Castor seed

5) Hypogeal/Epigeal germination

Draw labelled diagram showing the structure of the following seeds:

a) Bean

b) Castor

c) Maize

FUNCTIONS:

*a) Coleoptile

*b) Coleorrhize

*c) Aleurone layer

d) Seed coat

e) Micropyle

f) Endosperm

g) Radicle

h) Plumule

Give two examples each of seed:

a) Dicotyledonous albuminous.

b) Dicotyledonous Exalbuminous

c) Monocotyledonous albuminous

NAME THE FOLLOWING:

a) Food storage part in pea seed

b) Food storage part in castor seed.

c) Shield shaped Cotyledons in maize grain.

d) Fleshy whitish outgrowth at the micropylar end in castor seed.

e) Protective sheath covering Radicle in monocots.

FILL  IN THE BLANKS :

a) The non-endospermic seeds are also called as...(albuminous/Exalbuminous)

b) The inner layer of the Seed coat is called.....(testa/Tegmen)

c) The Plumule of the seed gives rise to...(shoot/root)

d) The germination in gram seed is....and that of bean seeds is ....(Hypogeal/Epigeal/viviporous)

*e) Caruncle is found in the seed of......(castor/pea)

f) Germination in Rhizosphora is....(viviporous/Epigeal)

g) The upper part of the embryo axis is called the...(Radicle/Plumule)

h) In... germination,the cotyledons remain under or just on surface of the soil.(Hypogeal/Epigeal)

True/false:

a) The protein-rich layer of endosperm in general grains is called Scutellum.

b) The outer layer of Seed coat is called testa.

c) Wheat grain is an Exalbuminous monocot seed.

d) In Hypogeal germination, the cotyledons remain below the ground surface.

e) The scar on Seed coat where the seed is attached to its stalk(funicle) is called Hilum.