Question

1. Very Short Answer Type Questions
(a) Define the following terms:
(i) Shearing
) Scouring
(iii) Reeling
(iv) Sericulture
(v) Bleaching
(vi) Degumming
(vii) Fleece
Science - Fibre to Fabric​

Answer 1

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(i) Shearing: The process of removing the fleece of the sheep along with thin layer of skin is called shearing. Once a sheep develops a thick coat of hair, it is shaved off to obtain wool. The process of cutting off the woollen fleece of sheep with a thin layer of skin is called shearing.

(ii) Scouring: Scouring is done to remove grease, dust and dirt from the raw sheared wool. In the process of scouring, fleece is washed with detergents and alkalis in special tanks to get rid of the grease, dust and dirt. After scouring, fleece of different textures are separated.

(iii) Reeling: The process of taking out silk fibres from the cocoons for use as silk is called reeling. Reeling is done in special machines which unwind the fibres of silk from cocoons.

(iv) Sericulture: Silk fibres are converted into silk yarn which is used for making silk cloth. The rearing of silkworms for obtaining silk is called Sericulture.

(v) Bleaching: Bleaching, a process of whitening fabric by removal of natural colour, such as the tan of linen, is usually carried out by means of chemicals selected according to the chemical composition of the fibre.

(vi) Degumming: In fat and oil processing: Water refining. Water refining, usually called degumming, consists of treating the natural oil with a small amount of water, followed by centrifugal separation. The process is applied to many oils that contain phospholipids in significant amounts.

(vii) Fleece- The hair covering the body of wool yielding animals such as sheep, yak, goat, etc. ... The hairy skin is sent to a factory where hair of different textures are separated or sorted.

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Answer 2

Answer:

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Explanation:

Shearing

The process of removing hair or cutting hair of a sheep in the form of fleece is called Shearing .

Scouring

The process of washing the fleece that removes dust , dirt , dried , sweat and grease is called scouring .

Reeling

The process of taking out silk fibres from cocoons for use as silk is called reeling .

Sericulture

The rearing of silkworms for obtaining silk is called Sericulture . 'Sericulture' means ' silk farming ' .

Bleaching(also as dyeing )

The natural fleece or hair of sheep (or goat ) is white woolen fibres obtained by sorting can be dyed in different colours .

Degumming ( silk scouring )

the process of removing the sericin, a sticky substance produced by the silkworm that holds the strands of silk together. It is also known as silk scouring .one-third of the weight may be lost when the gum is removed.

Fleece

The layered skin of a sheep is called fleece .

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