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Animal Fibres (in Hindi)
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This lessson discusses the process of formation of two animal fibres - wool and silk.

Sumeet Beniwal
Educator at Edusquad and Unacademy

U
Unacademy user
6/7 , nice explanation sir thank you
Yeshu Vashishtha
2 years ago
Hi Nitu It's good to see your consistency in hearing the lesson. Kindly review the course if you are liking it.
Nitu Kumari
2 years ago
I really like your course sir :-)
Yeshu Vashishtha
2 years ago
It's my pleasure. BTW R u doing self study or some coaching for UPSC CSE?
Nitu Kumari
2 years ago
sir m self std kr rhi hu bcoz m jis area m rehti hu wnha koi institute nhi h upsc k liye
Yeshu Vashishtha
2 years ago
Ok Great !!! Keep on studing. If any help required for preparation you can ask me.
Nitu Kumari
2 years ago
sure sir , thanks again
Yeshu Vashishtha
2 years ago
:-)
cater pillar and woolly dog
Caterpillar and woollydog
1st answer is the silkworm is a caterpillar and the 2nd answer is woolly dog does not yield wool
both a&b, woollydog , thank u so much..:)
  1. LESSON-3 Animal Fibres


  2. Sumeet Beniwal UPSC B.Sc (Medical) UPSC Aspirant Hobbies Teaching Debating Reading Cooking Follow me unacademy http://unacademy.com/user/sumi28796


  3. Animal Fibres Wool Animals that yield wool: sheep, goat, yak, cameland some other animals. . derived from these hairy fibres. . Sheep has two types of fibres (i) the coarse beard hair, (ii) the fine soft under-hair close to the Skin that provide the fibres for making wool


  4. From fibres to wool: Rearing and breeding of sheep: o Sheep are herbivores and rearers also feed them on a mixture of pulses, corn, jowar, oil cakes these sheep are "selectively bred" with one parent being a sheep of good breed Once the reared sheep have developed a thick growth of hair, hair is shaved off for getting wool .


  5. Quality of wool States where found Good quality wool Rajasthan, Punjab S.No Name of breed Lohi Uttar Pradesh, Himachal Pradesh Rajasthan, Punjab, Haryana Jammu and Kashmir Gujarat Gujarat Rampur bushairBrown fleece Nali Bakharwal Marwari Patanwadi Carpet wool For woolen shawls Coarse wool For hosiery 4


  6. Processing fibres into wool: . Step l: o The fleece of the sheep is removed. This process is called shearing. o Hair are removed during the hot weather. . Step Il: Hair is thoroughly washed in tanks to remove grease dust and dirt. This is called scouring


  7. Step III: The hairy skin is sent to a factory where hair of different textures are separated, this is called sorting. . The sorter get infected by a bacterium, anthrax, which causes a fatal blood disease called sorter's disease Step IV: o The small fluffy fibres are picked out from hair. o The fibres are scoured again and dried Step V: The fibres can be dyed in various colours Step VI: The fibres are straightened, combed and rolled into yarn



  8. Life history of silk moth The rearing of silkworms for obtaining silk is called sericulture. Egg is the first stage of a silkworm's life cycle. The second stage is that of larvae which are called caterpillars or silkworms. It swings its head from side to side and during these movements it secretes fibre made of protein. Soon it covers itself by silk fibres and turns into pupa. This covering is known as cocoon. The silk yarn (thread) is obtained from the cocoon of the silk moth The most common silk moth is the mulberry silk moth.



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