Question

After a sperm has penetrated an ovum, in the process of fertilization, entry of further sperms is prevented by

• A. Development of the vitelline membrane
• B. Development of the pigment coat
• C. Condensation of yolk
• D. Formation of fertilization membrane

Answer 1

Answer: (D)

Formation of fertilization membrane

The vitelline membrane is the membrane, which is adjacent to the outer surface of the plasma membrane of an ovum. When the spermatozoa fuses with the ovum, there is signal transduction, which results in deposition of several substances onto vitelline membrane and this get transformed into hard layer, which is called as the fertilization membrane.
Thus, the correct answer is option D, 'Formation of fertilization membrane'.