Development of sexual reproductive organs in the larval condition is known as:

At what stage is the primitive streak in the chick embryo formed?

In which of the following animals are cleavage divisions restricted to a small part of the cytoplasm and nucleus in the animal pole of the egg?

The vegetal hemisphere of an egg consists of:

In frogs and other vertebrates,the entire nervous system,including the ganglia,is derived from which germ layer?

Which of the following drugs inhibits metamorphosis in frogs?