Question

Which of the following animal does not show any metamorphosis in the larval stage?

• A. Pheretima posthuma
• B. Asteria
• C. Musca domestica
• D. Butterfly

Answer 1

Answer: (A)

Pheretima posthuma

Metamorphosis is a process in which one form of the organism gets transformed into another form and finally develops to form the adult. After the egg hatches, the organism forms the larvae which is an elongated worm like structure. This larvae develops to form pupa and then adult. There are many changes which occurs in the body of the organism during development through various stages in the life cycle. This is known as metamorphosis. There is cellular growth and differentiation which results in the formation of organs which performs different functions. Pheretima posthuma is an earthworm which belongs to the phylum Annelida. These are elongated worms. They hatch form the egg and forms the larvae which develops to form the adult which is like the worm. There are no changes which occur in the body or they do not form structures while passing through the larval stage of the life cycle. Therefore, the earthworms do not undergo metamorphosis.

Thus, the correct answer is option A.