Question

Grey crescent is the area [CBSE PMT 2005]
A) At the point of entry of sperm into ovum
B) Just opposite to the site of entry of sperm into ovum
C) At the animal pole
D) At the vegetal pole

Answer 1

B) Just opposite to the site of entry of sperm into ovum

Answer 2

The grey crescent area is the area that is present just opposite to the site if entry of sperm into the ovum.  

These are grey regions that is present on the surface of the egg opposite to the “site of entry” into the ovum.  

This region is formed due to the morphological and physiological changes that happen in the egg due to the entry of the sperm into the egg. It is most important for organisation of events in the egg.