Question

Cortical granules of oocytes are important __________________.

• A. To prevent fertilization between gametes of two different species.
• B. To attract sperms
• C. To prevent polyspermy
• D. To increase metabolic activity of ovum.

Answer 1

The correct option is C To prevent polyspermy

Answer is option C i.e. "To prevent polyspermy"
Fertilization of an ovum by more than one sperm is called polyspermy. It must be prevented else abnormal development is likely to result. The cortical reaction are involved in blocking additional sperms. In animals, a block to polyspermy is triggered by calcium ions inducing a cortical secretion reaction that generates a fertilization membrane/envelope preventing the entry of additional sperms.