2.
What are the functions of following parts of seed.
a) Seed coat b) Micropyle c} Endosperm
d) Radicle
Answers
Answer:
(a) Seed coat: It protects the delicate inner parts of the seed from injury and the attack of bacteria, fungi and insects.
(b) Micropyle: During germination, micropyle allows water to enter the seed through its pore.
(c) Endosperm: The endosperm plays an important role in supporting embryonic growth by supplying nutrients, protecting the embryo and controlling embryo growth by acting as a mechanical barrier during seed development and germination.
(d) Radicle: It forms the future root.
Answer:
In short:
a)The seed coat is the outer covering of a seed. It protects the seed as it is being dispersed.
b)Functions of micropyle: When soaked in water, the seeds absorb water mainly through the micropyle and make it available to the embryo for germination.
c)Endosperm is not photosynthetic, while cotyledons are. An endosperm gives nutrition for the young seedling, while a cotyledon gives to the developing embryo.
d)The primary root, or radicle, is the first organ to appear when a seed germinates.
Explanation:
In detail:
a)The purpose of the seed coat is to protect the seed from physical, temperature-related, or water damage. The seed coat also ensures that the plant seed remain in a state of dormancy until conditions are right for the plant embryo to germinate, or sprout.
b)Functions of micropyle: (i) When soaked in water, the seeds absorb water mainly through the micropyle and make it available to the embryo for germination.
c)The endosperm plays an important role in supporting embryonic growth by supplying nutrients, protecting the embryo and controlling embryo growth by acting as a mechanical barrier during seed development and germination.
d)The primary root, or radicle, is the first organ to appear when a seed germinates. It grows downward into the soil, anchoring the seedling. In gymnosperms and dicotyledons (angiosperms with two seed leaves), the radicle becomes a taproot.