Check sibling questions
Class 7
Chapter 3 Class 7 - Fibre to Fabric

How do the hair of certain animals help in keeping their bodies warm?

 

Answer:

Hair traps air in the body, which is a poor conductor of heat resulting in raising warmth.

 

To which class, animal fibre or plant fibre, artificial silk belongs to?

 

Answer:

Artificial silk is a plant fibre . It is produced using bamboo trees , and is hence also known as bamboo silk .

 

What is the maximum length of continuous silk thread that can be obtained from a cocoon?

 

Answer:

The maximum length of continuous silk thread that can be obtained from a cocoon - of continuous length -  is more than that of 1000 feet (1000 to 1500 feet).

 

Silk yarn of different textures can be prepared. Explain the statement.

 

Answer:

Silk yarn is obtained from the cocoon of the silk moth. 

There is a variety of silk moths, which look very different from one another and the silk yarn they yield is different in textures (coarse, smooth, shiny, etc.). 

Thus, tassar silk , mooga silk , kosa silk , etc are obtained from cocoons spun by different types of moths.

 

How do we get wool from sheep?

 

Answer:

Once the reared sheep has developed a thick growth of hair,

hair is shaved off for getting wool.

 

How is silk yarn obtained?

 

Answer:

Silk yarn is obtained from the cocoons of silk moths .

 

What are the types of silk obtained from cocoons spun by different types of moth?

 

Answer:

Tassar silk, Moonga silk, Kosa Silk, Mulberry Silk are different types of silk obtained from cocoon spun by different types of moth.

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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Economics, Accounting and English at Teachoo