Which of the following is not a post-fertilisation event?
(A) Endosperm development.
(B) Maturation of ovule(s) into seed(s).
(C) Maturation of ovary into fruit.
(D) Embryo development.
(E) Pollen grains development.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Only E
Post-fertilisation events are the events that follow double fertilisation: endosperm development, embryo development, maturation of ovules into seeds and maturation of the ovary into a fruit. Anything that happens before fertilisation is not one of them.
(A) Endosperm development. — A post-fertilisation event. The primary endosperm cell formed by triple fusion develops into the endosperm.
(B) Maturation of ovule(s) into seed(s). — A post-fertilisation event.
(C) Maturation of ovary into fruit. — A post-fertilisation event; it proceeds along with seed formation.
(D) Embryo development. — A post-fertilisation event. The zygote develops into the embryo.
(E) Pollen grains development. — Not a post-fertilisation event. Pollen grains develop in the anther before pollination, so this is a pre-fertilisation event.
So only E is not a post-fertilisation event.
NCERT Extract:
Post-fertilisation: Structures and Events – “Following double fertilisation, events of endosperm and embryo development, maturation of ovule(s) into seed(s) and ovary into fruit, are collectively termed post-fertilisation events.”
Stamen, Microsporangium and Pollen Grain – “… As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains ….”