Question

The fertilisation cone, which pulls the sperm into the egg, is formed from

• A. Acrosome ofthe sperm
• B. Aerosomal process of the perm
• C. Vitelline layer of the egg
• D. Plasma membrane of the egg

Answer 1

The correct option is D Plasma membrane of the egg

In humans, when the sperm approaches a mature egg the acrosomal contents of the sperms are released which digest the corona radiata and reaches the vitelline space. It comes in contact with receptors of zona pellucida and dissolves it to proceed towards the plasma membrane. The point where the sperm touches the plasma membrane of the egg the cytoplasm of the egg bulges to form a cone-like structure known as fertilization cone which retracts the nucleus and mid piece of the sperm inside the egg.

So, the correct answer is 'Plasma membrane of the egg'