Rainy season is the best season for cultivation of jute. It is grown in Bihar, Assam and West Bengal.

Synthetic fibres are more advantageous and economical than natural fibres due to following reasons:
(i) synthetic fibres are cheap
(ii) more resistant to water
(iii) high mechanical strength
(iv) easy to wash and handle
(v) dry up quickly.

Fibres obtained from plants and animals are called natural fibres.
Examples of plant fibres: cotton, jute and coconut.
Examples of animal fibres: silk and wool.

In ancient times, people used bark and big leaves of tree or animal skins and fur to cover themselves. Later on, they began weaving twigs, grasses etc. They twisted vines, animal fleece or hairs together into long strands. They were woven into fabrics.

The main features of fabric which is made up of coconut fibre
(i) The fibre in the coconut shell is also known as coir. It is the latest eco-friendly fabric.
(ii) Fabrics made from coconut fibre provide accelerated moisture management and protection from harmful UV (ultraviolet) rays.
(iii) Coconut fabrics are lightweighted, machine washable and naturally fit for comfort, quality and performance, e.g. doormats, brushes, mattresses, etc.

lf these are cotton yarns, they burn but do not shrink or melt. The burning yarn gives an odour similar to burning paper.
The silk yarn shrinks away from the flame and burns but does not melt. It has an odour of charred meat. The wool yarn also shrinks and burns but does not melt. It has a strong odour of burning hair.
The synthetic yarn shrinks and burns. It also melts and gives out an odour similar to burning plastics.

We need clothes because of the following reasons:
(i) They protect our body from heat and cold as well as rain.
(ii) They protect us from harmful bacteria and dirt, etc.
(iii) They make us presentable.
(iv) They help us to maintain body heat.

The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton wool are drawn out and twisted.This brings the fibres together to form a yarn.
A simple device used for spinning is a hand spindle also known as takli. Another hand operated device used for spinning is charkha.

Nylon, wool, cotton, silk, polyester, jute
Natural fibres  Wool, cotton, silk, jute.
Synthetic fibres  Nylon, polyester.