NEET 2011 Biology question

What happens during fertilisation in humans after many sperms reach close to the ovum?

(1)Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucidaCorrect
(2)All sperms except the one nearest to the ovum lose their tails
(3)Cells of corona radiata trap all the sperms except one
(4)Only two sperms nearest the ovum penetrate zona pellucida

Answer: (1)

Solution

Many sperms reach the ovum, but only one fertilises it. The acrosome of the sperm releases enzymes (hyaluronidase and acrosin, collectively sperm lysins) that dissolve the corona radiata and the zona pellucida, so one sperm can penetrate and enter the cytoplasm of the ovum. Contact of the

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-090693