Which of the following statements are correct in relation to formation of embryo and endosperm?
(A)Most zygotes divide only after certain amount of endosperm is formed.
(B)Embryo develops at the chalazal end of the embryo sac.
(C)The early stages of embryogeny are different in both monocots and dicots.
(D)Endosperm provides assured nutrition to the developing embryo.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A) and (D) only
After double fertilisation, the endosperm is the tissue that feeds the developing embryo. The two develop side by side inside the ovule.
(A) Most zygotes divide only after certain amount of endosperm is formed. — Correct. The zygote waits while the endosperm forms. This is an adaptation so that food is ready before the embryo starts to grow.
(B) Embryo develops at the chalazal end of the embryo sac. — Incorrect. The zygote lies at the micropylar end of the embryo sac, and the embryo develops there. The chalazal end is the opposite end.
(C) The early stages of embryogeny are different in both monocots and dicots. — Incorrect. The early stages (zygote, proembryo, globular and heart-shaped embryo) are similar in both. The difference comes later, when the dicot embryo has two cotyledons and the monocot embryo has one.
(D) Endosperm provides assured nutrition to the developing embryo. — Correct. This is the reason why the zygote divides late.
NCERT Extract:
Embryo –
