NEETZoologyHuman Reproduction
Select the correct statement regarding the structures in the Diagrammatic view of an ovum surrounded by few sperms:
Options
- AThe cells of the corona radiata form the innermost layer of the ovum.
- BThe perivitelline space is found between the plasma membrane of the ovum and the zona pellucida.
- CThe ovum is surrounded by the perivitelline space only.
- DThe zona pellucida prevents the entry of the first sperm.
Correct answer
B. The perivitelline space is found between the plasma membrane of the ovum and the zona pellucida.
Step-by-step solution
A is incorrect. The cells of the corona radiata form the outermost layer of the ovum. B is correct. The perivitelline space is found between the plasma membrane of the ovum and the zona pellucida. C is incorrect. The ovum is surrounded by both the zona pellucida and the perivitelline space. D is incorrect. 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 additional sperms. Thus, it ensures that only one sperm can fer