(i) We obtain wool from the fleece (hair) of sheep, cotton from cotton plant and silk from cocoons of siIk moth.
(ii) Step I - Shearing, Step II - Scouring, Step III - Sorting, Step IV - Fluffy fibres called burrs are picked out from hair, Step V- Dyeing of fibres, Step VI- Fibres are straightened, combed and rolled into yarn.
(iii) Yarns are used to knit sweaters.
(iv) Yak, Alpace, Llama, Angora goat, camel.
(v)By 'selective breeding' we can obtain the special characters is the woollen fibre.
(vi)Awareness regarding those animals who are used by human being for different types of clothing.

(a) female
(b) eggs
(c)larvae
(d) caterpillars
(e) silkworms
(f) pupa
(g) cocoon

Fibres and fabric play a large role in everyday application. A fibre is a hair-like strand of material. They are the smallest visible unit of a fabric and denoted by being extremely long in relation to their width. Fabric can be spun into yarn and made into fabric.A single fibre is too week to break but when it one made a fabric it is difficult to tear. Fabric needs more energy to tear apart as compared to single fibre.

A female silk moth lays hundreds of eggs at a time. The eggs are stored on the strips of the cloth or paper and sold to silkworm farmers. The farmers keep eggs under hygienic condition at suitable temperature and humidity. At a particular temperature, the larvae hatch from eggs. This happens when mulberry trees bear a fresh crop of leaves. The larvae called caterpillars or silkworms, eat day and night and increase enormously in size. The worms are kept in clean bamboo trays along with the freshly chopped mulberry leaves. After 25-30 days start to spin cocoons. The cocoons get attached with twigs placed in the trays. The cocoons are boiled or exposed to stearn to separate silk fibres. Silk fibres are then spun into silk threads

The wool is obtained from the hair of sheep in the following steps:
Step I-Shearing: The fleece of the sheep along with a thin layer of skin is removed from its body. Machines similar to those used by barbers are used to shave off hair. Usually, hair removed during the hot weather.
Step II-Scouring: The sheared skin with hair is thoroughly washed in tanks to remove grease, dust and dirt.
Step III-Sorting: The hairy skin is sent to a factory where hair of different textures are separated or sorted.
Step IV-The small fluffy fibres, called burrs are picked out from the hair. The fibres are scoured again and again and dried. 
Step V-Fibres can be dyed in various colours. 
Step VI-The fibres are straightened, combed and rolled into yarn. The long fibres are made into wool for sweaters and the shorter fibres are spun and woven into woollen clothes.

(a) The risks faced by people working in any industry due to the nature of their work are called occupational hazards.
(b) The people who do the job of sorting, sometimes, get infected by the bacteria called anthrax which cause a deadly blood disease called sorter's disease.
(c) Ajay is very caring, intelligent and sensible boy.

(a) Neha's mother took a thread of natural silk fabric and another thread of artificial silk fabric and burn them separately. The thread which burns giving a smell of burning hair will be natural silk (or pure silk). The thread which burns giving a smell a burning paper will be an artificial silk.
(b) Yes, pure silk saree is more costly than an artificial one.
(c) Neha's mother is intelligent and knowledgeable.

In first saree, one thread which burnt with a smell of burning hair is from pure silk, silk and hair are protein fibres. So, on burning these threads, a smell of burning hair comes out. In second saree, second thread which burnt with the smell of burning cotton and paper because cotton and paper both are carbohydrates and on burning they give similar smell.