Fertilisation and sperm penetration and 30 questions

Post fertilisation event and parthenogenesis with 30 questions

Assertion: All copulations do not lead to the fertilisation and pregnance. Reason: Fertilisation can occur only if the ovum and sperms are transported simultaneously to the ampullary isthmic junction.

Assertion: All copulations cannot lead to fertilisation and pregnancy. Reason: Fertilisation can only occur if the ovum and sperms are transported simulaneously to the ampullary region.

A : All copulations do not lead to fertilisation and pregnancy . R : Fertillsation can occur if the ovum and sperms are transported simultaneously to the ampullary - isthmic junction

Assertion: Only one sperm can fertilise an ovum. Reason: During fertilisation, a sperm comes in contact with zona pellucida layer of the ovum and induces changes in the membrane that blocks the entry of additional sperms.

The advantages that internal fertilisation has over external fertilisation is that in internal fertilisation :

Preparation of sperm before penetration of ovum is

Preparation of sperm before penetration of ovum is

Write short notes on following events of the process of fertilisation: (i) Penetration of sperm into ovum. (ii) Cortical reaction of the ovum.