Differentiate between:

External fertilization and internal fertilization

Kavitha found a tadpole in a pond. She collected it carefully and put it in an aquarium supposing it as a fish. After some days what did she find and why?

Differentiate between:

External fertilization and internal fertilization

Sketch the diagrams of male and female reproductory systems?

State the reason why most of the terrestrial animals’ fertilisation takes place internally.

What would happen if all the organisms stop the process of reproduction?

Who am I?

a) I am formed by the fusion of male and female gametes...

b) I am a gamete that has a tail and travel to fuse with female gamete...

c) I am a fully developed embryo inside a mother’s body...

Why do fish and frog lay more number of eggs whereas cow and human beings usually give birth to only one at a time?

How would you appreciate Ritwik’s work when he kept back the pigeon squab in the ventilator? If you were in Ritwik’s place what would you do?