Question

What is acrosomal reaction?

• A. Contact of sperms with egg
• B. Digestion of zona pellucida
• C. Disintegration of acrosome
• D. Contact of acrosome and nucleus of egg

Answer 1

Answer: (B)

Digestion of zona pellucida

• A sperm fuses with the plasma membrane of an egg cell and penetrates to fertilise it. The acrosome reaction occurs before the sperm cell reaches the zona pellucida. Acrosin digests the zona pellucida and membrane of the oocyte. Part of the sperm's cell membrane then fuses with the egg cell's membrane, and the contents of the head sink into the egg. Hence, the acrosomal reaction is digestion of zona pellicuda.
• So, the correct answer is 'digestion of zona pellicuda'.