Home
Class 12
BIOLOGY
Assertion: Only one sperm can fertilise ...

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.

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.

Text Solution

Verified by Experts

The correct Answer is:
A
(A)
Only one sperm can fertilise an ovum because 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.
Promotional Banner

Similar Questions

Explore conceptually related problems

During fertilixation, a sperm comes in contact with the which layer of the own.

Fill up the blanks in the following paragraph by selecting the correct option. During copulation (coitus) semen is released by the penis into the vagina and is called (i)._____.the ovum released by the ovary is transported to the (ii)._____where (iii).______takes place during fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of (iv)._____The secretions of the (v)._____help the sperm enter into the cytoplasm of the ovum.

Which event ensures that only one sperm can fertilize an ovum ?

Which of the following layers of the ovum undergoes changes to prevent polyspermy when sperm contacts with it ?

How is the entry of only one sperm and not many ensured into an ovum during fertilization in humans?

Assertion: All copulations cannot lead to fertilisation and pregnancy. Reason: Fertilisation can only occur if the ovum and sperms are transported simulaneously to the ampullary region.