Samacheer Class 7 Science - Animals in Daily Life

Silk has natural beauty and elegance.
It gives comfort in warm weather and warmth during colder months.
It is used in the manufacture of classical and high fashion clothes, modern dresses particularly silk sarees, the elegant of beautiful dresses.
It is also used in household for making wall hangings, curtains, rugs and carpets.
It is also being used in the manufacture of surgical threads for sutures.

It is also known as Peace silk.
In 1992, Kusuma Rajaiah, a Government officer from Andhra Pradesh state of India proposed ahimsa way of silk production for the making silks without killing the silkworm.
It involves a humane method specifically letting the worms to hatch and then using the vacant cocoons.
Traditional silk manufacturing methods involve boiling the cocoons of the silk worms and then sorting out the threads, which is used later in silk production.
It has been supported by many people who are interested in the welfare of animals.

Generally, the workers in silk industry affected with arthritis is they stand for a long time reeling the silk into yarn.
They also develop back pain and visionary problem and skin injuries.
Some time they may suffer from respiratory problem like asthma and bronchitis due to poor ventilated area of their work.

The processing of wool involves five major steps.
They are as follows Shearing, Grading (or) Sorting, Washing (or) Scouting, Carding and Spinning.
Shearing:- The fleece of the sheep is removed from its body. This is called shearing.
Grading (or) Sort:- The fleece from the same sheep may be different from different
parts of the body. It is sorted out into separate piles of similar nature. This is known as Grading (or) Sorting.
Washing (or) Scouts: The sheared skin is washed thoroughly with soap (or)
detergents to remove dirt, dust and grease.
Carding:- The dried wool is carefully removed. These fibres then passed through the rollers which are covered with fine sheet of thin wire teeth. This process arranges the wool into a flat sheet called a web.
Spinning:- The web is drawn into narrow strand and then passed through spinning machines. The spinning machines twist the strands into yarn. The yarn is wound to form balls of wool. This yarn is either weaved into fabric (or) retained for knitting.

Wool is a multifunctional fibre with a range of diameters that makes it suitable for clothing, household fabrics and technical textiles.
Two third of wool is used in the manufacture of garments including sweaters, dresses, coats and active sportswear.
Blended with other natural (or) synthetic fibres wool used as adds drape and crease resistance blankets, anti-static and noise absorbing carpets.

Silk is the strongest natural fibre.
It is thin light in weight, strong.
It is easly to peak and unfold.
It is also fire resistant.
It is dries quickly.
It is also resistant to abrasion and chemicals.

Honey has high levels of sugar.
It has antiseptic and antibacterial properties.
It can prevent cancer, heart diseases reduce ullcer and digestive problems.
It also soothes coughs and sore throats.
Hence it is recommended for all.