Chapter-3. Fibre to Fabric Science class 7 in english Medium CBSE Notes

1. Natural fibres : The fibres which are obtained from plants and animals are called natural fibres. 

Examples of natural fibres: 

(i) Fibres obtained from plants : Cottons, Jute etc.

(ii) Fibres obtained from animals : Wool and silk.

2. Synthetic Fibres : Nylon, polyesters, Acrilyc etc. 

Obtaining Wool: Wool is obtained from the fleece (hair) of sheep or yak.

Obtaining Silk : Silk fibres come from cocoons of the silk moth.

Animals by which obtain wool : Wool comes from sheep, goat, yak and some other animals.

The hairy skin of the sheep has two types of fibres that form its fleece:

(i) the coarse beard hair, and
(ii) the fine soft under-hair close to the skin.

Selective breeding:

The process of selecting parents for obtaining special characters in their offspring, such a soft under hair in the sheep, is ‘termed selective’.

• sheep wool and Yak wool is common in Tibet and Ladakh.
• Angora wool is obtained from angora goats, Found in hilly regions such as Jammu and Kashmir.
• The fur (hair) on the body of camels is also used as wool. Llama and Alpaca, found in South America, also yield wool.

Pashmina shawls : Wool is also obtained from goat hair. The under fur of Kashmiri goat is soft. It is woven into fine shawls called Pashmina shawls.

Name of Animals which yield wool :

(i) Angora goat

(ii) Goat

(iii) Sheep 

(iv) Camel 

(v) yak 

(vi)  Llama 

(vii) Alpaca