What types of fertilization takes place in the following?

(a) Cow (b) Frog

(c) Humans (d) Fish

(e) Hen

What is meant by the terms ‘internal fertilization and ‘external fertilisation’? Explain with example.

Draw a labeled diagram of the human female reproductive system.

(a) Where in the human body does an egg (or ovum) get fertilized 

(b) Where does a fertilized egg (or zygote) develop into a baby in the human body?

Why do female frogs (or female fish) lay hundreds of eggs?

What is meant by an ‘embryo’ ? Can we identify the body features in an embryo ?