Question

Silk fibre is obtained from
a.) Fleece of sheep
b.) Cotton ball
c.) Cocoon
d.) Shiny jute stalk

Answer 1

Hint: Try to recall that silkworm produces silk and the silk is obtained from larvae of silkworms. Also, silkworm secrets fibre made up of protein. Now, by using this you can find the correct option from the given ones.

Complete Step by Step Solution:
We know that silkworms produce silk. Silk is a natural protein fibre which can be woven into textiles.
Also, the protein fibre of silk is made up of fibroin and is produced from silkworm’s larvae to form cocoons.
The protein fibre secreted by silkworm gets hardened on exposure to the atmosphere and becomes silk fibre.
Silkworm gets completely covered by the silk fibre and this covering is called cocoon which is processed further to obtain silk fibre.
Therefore, from above we can now say that option C is the correct option.

Additional information:
In order to get silk secreted by silkworm, following steps has to be followed:
Step-1: In this step, cocoons are collected and are kept under the sun. or boiled or exposed to steam. This helps in separating out the silk fibres from cocoons. The process by which silk fibre is separated from the cocoon is called reeling the silk.
Step-2: In this step, spinning of silk fibre obtained from cocoon into silk thread is done,
Step-3: Finally, in this step the silk threads obtained are woven into the desired clothes.

Note: It should be remembered that the best silk is obtained from the cocoons of larvae of mulberry silkworm.
The commercial cultivation of silkworms to produce silk is known as sericulture or silk farming.
The commercial species of silkworm used for sericulture are Bombyx and Mori.