Question

Assertion (A): Fertilisation occurs when ovum and sperm are transported simultaneously to the ampullary-isthmic junction.

Reason (R): During fertilisation a sperm comes in contact with the zona pellucida layer of the ovum.

Options

• Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

• Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

Explanation:

Fertilisation occurs when sperm and ovum meet at the ampullary–isthmic junction. Sperm contact with the zona pellucida is an event during fertilisation, but it does not explain the need for simultaneous transport to that site.