Question

Ovum receives the sperms in the region of
A. Animal pole
B. Vegetal pole
C. Equator
D. Pigmented area

Answer 1

Hint: Ovum receives the sperms where nucleus is present and there sperm penetrates the ovum and sperm's nuclei to fuse with the nucleus of ovum to form the zygote.

Complete answer:
Ovum receives the sperms where nucleus is present and there sperm penetrates the ovum and sperm's nuclei to fuse with the nucleus of ovum to form the zygote. Ovum acquires a polarity between the two poles and they become distinct.

> Option A which is a vegetable pole. At the vegetal pole, cytoplasm is more active generally and it contains nucleus at the one end while at the other the cytoplasm is less active and it contains most of the yolk not the nucleus, this pole is called the Vegetal pole.

> Option B which is Animal pole. At the animal pole, there is presence of nucleus and the sperm penetrates the ovum and the sperm's nucleus to fuse with the nucleus of the ovum in order to form the zygote and that is called as the animal pole.

> Option C which is the equator. At equator ovum does not receive the sperms as there is no presence of nucleus and it cannot be the right option because of this.

> Option D is a pigmented area and there is also absence of nucleus since the nucleus is present in the region of Animal pole. Therefore, this option is also the incorrect one and it gets eliminated.

Hence, the correct answer is option (B).

Note: Ovum at the animal pole receives the sperm and here the sperm makes the fusion of ovum and the nucleus of the sperm to form the zygote and there is present is nucleus at animal pole only and thus it is the right option which is Animal pole.