Question

Which of the following parts of the caterpillar swings side to side during the formation of cocoons around the caterpillar?
A. Head moves
B. Neck moves
C. Abdomen moves
D. Thorax moves

Answer 1

When a female silk moth lays eggs, the life cycle of the silk moth begins. The silk moth's caterpillars or larvae hatch from the silk moth's eggs. Silkworms produce pupa by feeding on mulberry leaves. To keep itself alive during the pupa stage, the silkworm weaves a net around itself. After that, it swings its head, spinning a protein fibre that eventually turns into silk. The cocoon is a protective layer formed by many caterpillars that surround the pupa. The silk thread (yarn) is made from the cocoon of the silk moth.

Complete answer:
Option A: Eggs are laid by the silk moth. Larvae hatch from these eggs. Caterpillars are the larvae of these insects. It weaves a net to hold itself together before moving on to the pupa stage of its life cycle. The head then moves from side to side. It secretes a protein that hardens when exposed to air and produces silk fibre during this swing. The coating of this protein that develops as a result of head movement is known as the cocoon.
So, option A is correct.
Option B: During the development of the cocoon surrounding the caterpillar, the head swings from side to side.
So, option B is incorrect.
Option C: Caterpillars, also known as Silkworms, are larvae that hatch from the female silk moth's eggs. They grow in size, and when the caterpillar is ready to transition to the pupa stage of life, it spins a net to keep itself in place and swings its head in a figure eight pattern.
So, option C is incorrect.
Option D: Caterpillars or Silkworms are larvae that hatch from the eggs laid by the female silk moth. They develop in size, and when the caterpillar is ready to move on to the pupa stage of its life, it weaves a net to hold itself in place and swings its head from side to side in a figure eight pattern.
So, option D is not correct.

Hence, Option A is the correct answer..

Note:
The protective covering made of silky threads that covers the larvae of moths and other insects such as butterflies is known as a cocoon. The cocoon is where the larvae develop into adult insects. The pupa is the stage of development that is protected by the cocoon. The pupa is also the stage that occurs between the larva and the adult.
The pupa of a moth is clothed in silk when it makes a cocoon, whereas the pupa of a butterfly is known as chrysalides and has no silk covering.