RBSE Class 7 Science Notes Chapter 3 Fibre to Fabric

These comprehensive RBSE Class 7 Science Notes Chapter 3 Fibre to Fabric will give a brief overview of all the concepts.

RBSE Class 7 Science Chapter 3 Notes Fibre to Fabric

→ Wool and silk are the fibres obtained from animals.

→ Wool is obtained from the fleece (hair) of sheep or yak. Silk fibres are obtained from the cocoon of the silk moth.

→ Wool was the first fibre to be spun into yarn.

→ Apart from sheep, wool also comes from the Angora goat, Yak, Llama, Alpaca and Camel.

→ These animals have thick hair on their body because they trap a lot of air. Air is a poor conductor of heat and does not let body heat to escape. So, hair keep these animals warm.

→ Fleece and wool bearing animals bear two types of hairs; coarse hair and fine soft under hair close to the skin. The fine hair provide the fibres for making wool.

→ The hair provide woollen fibres. Woollen fibres are then processed to obtain woollen yam.

→ The processing of fibre into wool can be represented as follows:

→ Silk fibres are made of a protein.

→ The silk yam (thread) is obtained from the cocoon of the silk moth.

→ Weavers weave silk threads into silk cloth.