During Fertilization Polyspermy Is Prevented by Mcq?

Solution: Polyspermy is prevented by Depolarization of membrane due to entry of sperm lead to influx of Ca and then cortical granules release to form fertilization membrane.

How is polyspermy prevented during fertilization?

To prevent polyspermy, the zona pellucida, a structure that surrounds mammalian eggs, becomes impermeable upon fertilization, preventing the entry of further sperm. The structural changes in the zona upon fertilization are driven by the exocytosis of cortical granules.

How is polyspermy prevented during fertilization Class 12?

Class 12th Biology 2017 Set3 Delhi Board Paper Solution

When a sperm comes in contact with the zona pellucida layer of the ovum, it induces changes in the membrane of the ovum to block the entry of additional sperms. This, thus, prevents the polyspermy and ensures that only one sperm can fertilise an ovum.