What are viviparous and oviparous?

Seminiferous tubules are found in :

Observe the picture. Answer the following question:

This is the life cycle of a _____.

Complete the crossword puzzle:

Across
1. The process of the fusion of the gametes.
6. The type of fertilisation in hen.
7. The term used for bulges observed on the sides of the body of Hydra.
8. Eggs are produced here.

Down
2. Sperms are produced in these male reproductive organs.
3. Another term for in vitro fertilisation.
4. These animals lay eggs.
5. A type of fission in Amoeba.
 

Observe the picture. Answer the following question:

The cluster of eggs produced by this animal is called _____.

Modern techniques like a surrogate mother, sperm bank, and IVF technique will help human beings. Justify this statement.

Explain the concept of IVF.