Three grades of silk obtained from a cocoon are :
(a) Reeled silk: It is the unwound fibres and form the finest quality of silk.
(b) Spun silk: It is the carded or combed silk from left overs after the reeled silk. It constitutes an inferior quality. It is slightly honey coloured.
(c)Nail silk: Still shorter fibres left behind after carding constitute an even inferior quality of silk.It is a richly textured rough silk.

After brushing, filaments from four to eight cocoons are joined and twisted. About 48 such twisted filaments are joined to make a thread that is wound on a reel. This thread is called raw silk.

Sericulture and moriculture.

(i) Rearing: Raising the sheep and taking its care is called rearing.
(ii) Shearing: For obtaining wool, the fleece of the sheep together with a thin layer of skin is taken off its body. This process is known as shearing.
(iii) Sericulture: By sericulture we mean the rearing of silkworms for obtaining silk.

The correct order is
(e) Female silk moths lay eggs.
(a) Eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
(d) The larvae/caterpillars or silkworms are kept in clean trays along with freshly chopped mulberry leaves.
(c) After 25 to 30 days, the caterpillers stop eating and start spinning Cocoons.
(f) Cocoons are kept under the sun or boiled in water.
(b) Fibres are taken out from the Cocoon.

(a) Eggs of silk moth on mulberry leaves
(b) Silkworm
(c) Cocoon
(d) Cocoon with developing moth

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.

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.

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.