Yak, camel and Sheep.

The wool fibres are dried and then disentangled. They are then combed and straightened by a cardinal machine. This is called carding.
In the cardinal machine, the disentangled woollen fibres are passed between a pair of rotating cylinders covered with a material called carding cloth, which contains fine, pliable wire teeth. The wool emerges from the rollers in the form of thin wire called web.

The caterpillar eats day and night the leaves of mulberry tree and grows big in size whereas its skin does not increase in size, shape or length.
During the feeding period, a silkworm sleeps four times (24 h each time) at intervals of six days. While Sleeping, its skin cracks and on awakening, the worm leaves the old skin and comes out in a new one. So, it sheds skin and this phenomenon is called moulting. After the final moulting begins, the last feeding period (of about ten days) after which the worm grows to its full size.

Correct sequence is

(i) Shearing
(ii) Scouring,
(iii) Sorting
(iv) Fibre spinning,
(v) Dyeing
(vi) Rolling intp the yarn

(a) Sericulture
(b) Silkworm
(c) Mulberry
(d) Reeling

A pile of cocoons is used for obtaining silk fibres. The cocoons are kept under the sun or boiled or exposed to steam! the silk fibres separate out. The silk fibres from many cocoons are brought together to form a single silk thread. This is called reeling of illk

When someone pulls our hair, it hurts because it's root is connected to the skin which has sensation. But, during haircut the tip of the hair is cut which is dead and does not have any sensation. So hair-cut
does not hurt.

The larva (or caterpillar) of a silk moth makes the silk fibre.

Hair traps a lot of air which is a poor conductor of heat resulting their body warm.

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

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.