Ans. Caterpillars’ bodies grow but their exoskeleton doesn't grow. Hence, they have to shed their exoskeletons when they grow bigger.
Ans. The fleece of the sheep along with a thin layer of skin is removed from its body. This process is called shearing.
Ans. Steps involved in the processing of wool are: Shearing, Scouring, Sorting, Picking out burrs, Dyeing of fibres, Making of yarn.
Ans. Wool is also obtained from goat hair. The under fur of Kashmiri goat is soft. It is woven into fine shawls called Pashmina shawls.
Ans. Hair trap a lot of air. Air is a poor conductor of heat. So, thick coat of hair keeps these animals warm.
Ans. A fibre is a long strong thread, which is obtained from natural sources like plants or manmade sources like synthetic fibres.
Ans. Machines similar to those used by barbers are used to shave off hair.
Usually, hair are removed during the hot weather.
Ans. Shearing does not hurt the sheep because the uppermost layer of the skin is dead. Also, the hair of sheep grow again just as our hair does.
Ans. The sheared skin with hair is thoroughly washed in tanks to remove grease, dust and dirt. This is called scouring.
Ans. Angora wool is obtained from angora goats, found in hilly regions such as Jammu and Kashmir.
Ans. Traders and travellers introduced silk to other countries. The route they travelled is still called the ‘silk route’.
Ans. Sheep are herbivores and prefer grass and leaves. Apart from grazing sheep, rearers also feed them on a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals.
Ans. Rearing and breeding of sheep is popular in Jammu & Kashmir, Himachal Pradesh, Uttaranchal, Arunachal Pradesh and Sikkim, or the plains of Haryana, Punjab, Rajasthan and Gujarat.
Ans. The hairy skin of the sheep has two types of fibres that form its fleece: (i) the coarse beard hair, and
(ii) the fine soft under-hair close to the skin.
Ans. Caterpillars should not be collected with bare hands because they have thick stingy hair which may causes irritation to our skin. So, use a paper napkin or a paper to hold a caterpillar.
Ans. Wool industry is an important means of livelihood for many people in our country. But sorter’s job is risky as sometimes they get infected by a bacterium, anthrax, which causes a fatal blood disease called sorter’s disease.
Ans. Some breeds of sheep possess only fine under-hair. Their parents are specially chosen to give birth to sheep which have only soft under hair. This process of selecting parents for obtaining special characters in their offspring, such as soft under hair in sheep, is termed ‘selective breeding’.
Download to practice offline.