Question

A chemical substance fertilizin is found in the eggs of animals.
A. Reason: It helps in the maturation of embryos after fertilization.
B. Both assertion and reason are correct and Reason is the correct explanation for assertion.
C. Both assertion and reason are correct and Reason is not the correct explanation for assertion.
D. Assertion is correct but reason is incorrect
E. Both Assertion and Reason are incorrect.

Answer 1

Hint:-The fertilization process involves the fusing of sperm with an ovum. The production of a zygote cell, or fertilised egg, is the outcome of this union, initiating prenatal development. Fertilization stages can be split into four activities: 1) preparation of sperm, 2) recognition and binding of sperm-eggs, 3) fusion of sperm-eggs and 4) fusion of sperm and egg pronuclei and zygote formation.

Complete Answer:-The ovum, plural ova, is a single cell released from either of the female reproductive organs, the ovaries, which, when fertilised (united) with a sperm cell, can develop into a new organism.
Fertilizin is a glycoprotein that occurs on the ovum membrane. The chemical material released by the ovum is fertilized, which is found in an egg and plays a vital function in fertilisation. Sperm has a protein substance called antifertilizin (made up of acidic amino acids) on its surface. The egg fertilizing interacts with the sperm antifertilizin of the same species. This interaction makes the sperm cling to the surface of the egg. The adhesion of sperm via chemical recognition to the egg of the same species is acknowledged as agglutination.

So, the correct answer is ‘Assertion is correct but reason is incorrect’, option (C).

Note:- Several reactions are initiated in the egg by the fusion of two gametes. One of those causes a change in the membrane(s) of the egg so that more than one spermatozoon cannot attach and penetrate. Egg activation, which enables the egg to undergo cell division, is the most significant outcome of fertilisation. In humans, the fertilisation process takes place inside the fallopian tube.