Question

The capacitation of sperms plays a significant role in the process of fertilisation in humans.

Which of the following events are associated with the process of capacitation?

1. Large quantity of Ca⁺² ions enter the sperm to enhance the permeability of the acrosome.
2. Antifertilisin reacts with the fertilisin protein.
3. Membrane covering the sperm head and acrosome gets removed.

पर्याय

• I and II only

• I and III only

• II and III only

• I, II and III

Answer 1

I and III only

Explanation:

Capacitation is the last step in sperm maturation that happens inside the female reproductive tract. It makes the sperm capable of fertilising the egg.

• Event I: A large amount of Ca²⁺ ions enter the sperm, which increases the permeability of the acrosome and prepares it for the acrosome reaction.
• Event III: The membrane covering the sperm head and acrosome is removed, exposing receptors that help the sperm bind to the egg.
• Event II: The interaction between antifertilisin and fertilisin occurs during fertilisation, not during capacitation.