Question

Silk is obtained from the silk moth.
A.Pupa
B.Larva
C.Cocoon
D.Caterpillar

Answer 1

Hint: Silk is a natural protein fiber and is one of the important animal fibers obtained from silkworm. The different types of silk are produced by different types of silkworms. It can further be differentiated on the basis of luster and texture.

Complete step by step answer:
Basically, silk was discovered in China during the reign of emperor Huang-ti. It was considered as one of the most valuable fibers at that time because of luster and fine quality. According to historians, it was made in India as well because during the Indus valley civilization, its uses were noticed.
Now, different types of silk are produced by different types of silkworms. So, let’s discuss the life cycle of Silkworm. Basically, the silkworms are not actually born as worms rather as larvae and caterpillars are hatched from the eggs of silk moths. So, in the beginning the female silk moth lays eggs and then the larvae are hatched out of the eggs and are further known as caterpillars. They grow up in size and enter the second stage known as pupa. Before they enter in the second stage, the caterpillar swings their head from sides and makes the shape of eight every time. Further, during all these times, they secrete fiber made up of protein which comes in contact with the air, hardens and then becomes a silk fiber. After this the caterpillar completely covers itself and by the fiber and turns into a pupa and this covering is further known as cocoon. The silk moth develops in the covering called a cocoon and the silk fiber is obtained from the Silk moth’s cocoon.

Hence, option C is correct.

Note: Sericulture is a process of cultivating silkworms and extracting silk from them. Moreover, the caterpillars of the domestic silkmoth are the most commonly used silkworm species in sericulture.