This section contains Assertion (A) and Reason (R) type questions. Each question has choices (1), (2), (3) and (4), out of which only one is correct.
Assertion (A) During fertilisation only head of spermatozoa enters the egg.
Reason (R) If several spermatozoa hit the egg at same time, all can enter.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

C

Explanation

During fertilization only the sperm nucleus containing 23 chromosome present in head enter into egg. As the sperm head come in contact with the fertilization cone it causes depolarization of ovum membrane and thus prevent polyspermy.