question_answer

Study the figure given below and answer the questions that follow?

(i) Identify A and mention its importance.

(ii) Which changes occur in ovum during this stage?

Answer:

(i) A- Zona pellucida

During fertilisation zona pellucida ensures that only one sperm can fertilise an ovum.

(ii) In the process of fertilisation, a spermcomes in contact with the zona pellucida (A) layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms.