Question

Dintinguish between direct and indirect development

Answer 1

Answer:

Direct development Indirect development

It is a type of development in which an embryo develops into a mature individual without involving a larval stage. It is a type of development that involves a sexually-immature larval stage, having different food requirements than adults.

Metamorphosis is absent. Metamorphosis involving development of larva to a sexually-mature adult is present.

It occurs in fishes, reptiles, birds, and mammals. It occurs in most of the invertebrates and amphibians.

Answer 2

Explanation:

Direct development :-

1) There is no intermediate stage.

2) The young ones resemble the adults in all aspects expects colour and size

3) Metamorphosis is absent

4) Example :- Hydra, Man

Indirect development :-

1) The young ones usually pass through one or more intermediate stage before becoming an adult.

2) The young ones do not resemble the adults

3) Metamorphosis is present

4) Example :- Frog , Housefly