Question

Which statement correctly defines the oogamy process in lower groups of plants?
A. Fusion of large motile egg and a small non-motile sperm.
B. Fusion of large non-motile female gamete and a small non-motile male gamete.
C. Fusion of large non-motile eggs with small motile sperm.
D. Fusion of small non-motile female gametes with large motile male gametes.

Answer 1

Hint: Oogamy is a type of sexual reproduction where there is fusion of male and female gametes in the lower group of plants, for example, Chara and Volvox.

Complete answer:
Oogamy is a type of sexual reproduction in the lower group of plants, for example, Chara and Volvox. In this type of sexual reproduction, the female gametes i.e., eggs, these are big and also they are non motile which means immovable but the male gametes which are sperms are small and motile which means movable. Now if we look at the options we can give then answer easily.

> Option A which is Fusion of large motile egg and a small non-motile sperm. This option is incorrect as in oogamy, the egg is larger but it is non-motile and the sperm is small but it is motile and in this option the opposite is given and therefore it is an incorrect one.

> Option B which is Fusion of large non-motile female gamete and a small non-motile male gamete. This option is also incorrect as in oogamy, the egg is larger and it is non-motile but the sperm is small and motile and in this option sperm is small and motile. Therefore, this is the incorrect option and it gets eliminated.

> Option C which is Fusion of large non-motile egg with a small motile sperm. This is completely correct as in oogamy there is fusion of large and non motile with the small motile sperms and that is exactly given in the option. So, this option is the correct one.

> Option D which is Fusion of small non-motile female gamete with a large motile male gametes. In oogamy, female gametes are not small but they large and non motile, sperms are smaller and motile. Therefore, this option is also not the correct one.

Hence, the correct answer is option (C).

Note: In sexual reproduction of oogamy, there is fusion of female and male gametes where female gametes are larger and male gametes are smaller and along with this female gametes are non-motile i.e., immovable and male gametes are motile i.e., movable and upon this the answer is dependant which is now easy to crack.