Assertion: Only one sperm can fertilise an ovum.
Reason: During fertilisation, a sperm comes in contact with zona pellucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms.

Options

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

Answer

A

Explanation

Only one sperm can fertilise an ovum because during fertilisation, a sperm comes in contact with zona pel lucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms.