What is
What is meant by scouring?
Give two characteristics of wool.
What is silk? How is it obtained?
Why are the cocoons boiled in hot water or treated in oven
Why do we not wait for the silk moth to hatch and then boi
Why do we need to boil the cocoons for extraction of silk?
ort Answer Type-ll Questions:
Why does shearing not hurt the sheep? P.No 34
Differentiate between silk and wool.
What are raw silk and spun silk?
With the help of a flow chart, describe the life cyclo
Answers
Explanation:
What is meant by scouring?
scouring is the procces to clean or brighten the surface of (something) by rubbing it hard, typically with an abrasive or detergent
Give two characteristics of wool.
Crimp
Elastic
Fire resistant
Soft
Warm
What is silk? How is it obtained?
The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture).
Silk is obtained from the cacoon of the silkworm . Silkworm are fed on the leaves of the mulberry trees. Each worm spins a continuous thread up to 800 metre long to make a cocoon. The cocoon is boiled in water to kill the silkworm alive and then unwound to get silkfibre.
Why are the cocoons boiled in hot water or treated in oven?
To obtain fibre from concoons like silk we boil it in very hot water instead of ovens.
Why do we not wait for the silk moth to hatch and then boil?
When the silk worms become an adult moth , during the process when the moth comes out of the cocoon, it releases a spit which dissolves the silk in the cocoon so that it can come out thereby destroying the silk itself. Hence the farmers cannot wait for the cocoon to hatch.
Why do we need to boil the cocoons for extraction of silk?
Thread extraction
The cocoons are placed into boiling water in order to soften and dissolve the gum that is holding the cocoon together. This is a crucial step in the silk production process as it ensures that there is no damage to the continuity of each thread.
Why does shearing not hurt the sheep?
Because shearing involves in taking out of fleece of the sheep with a thin layer of skin.It does not hurt them because their upper layer of skin is dead.So it is the only reason for that
Differentiate between silk and wool.
Silk and wool are two types of fibers that are obtained from animal sources.
Silk is manufactured from the cocoons of silkworms whereas
wool is manufactured from the fur of furry animals like goats.
What are raw silk and spun silk?
The difference between raw silk and spun silk are-: Raw silk is silk containing a gummy substance called sericin. ...
Spun silk is made from short lengths obtained from damaged cocoons or broken off during processing, twisted together to make yarn.
With the help of a flow chart, describe the life cyclo
ans in image
Answer:
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Borahae
What is meant by scouring?
ANSWER; The process of washing of sheared skin with hair in tanks to remove any kind of dust, dirt or grease is called scouring.
Give two characteristics of wool.
ANSWER;
Diameter (microns)
Staple length.
Uniformity of fleece.
Elasticity.
Strength/Durability.
Luster.
Felt-ability.
How is it obtained?
Silk is obtained from the cacoon of the silkworm . Silkworm are fed on the leaves of the mulberry trees. Each worm spins a continuous thread up to 800 metre long to make a cocoon. The cocoon is boiled in water to kill the silkworm alive and then unwound to get silkfibre.
What is silk?
Silk is a natural fibre made by the silk worm cocoon. Silk fibres are very strong and are often used to make cloth. ... In the past, silk was used to make parachutes. The practice of growing silkworms for silk production is called sericulture. Most spiders make a natural fibre of their own that is also called silk.
Why are the cocoons boiled in hot water or treated in oven?
To obtain fibre from concoons like silk we boil it in very hot water instead of ovens.
Why do we not wait for the silk moth to hatch and then boil?
When the silk worms become an adult moth , during the process when the moth comes out of the cocoon, it releases a spit which dissolves the silk in the cocoon so that it can come out thereby destroying the silk itself. Hence the farmers cannot wait for the cocoon to hatch.
Why do we need to boil the cocoons for extraction of silk?
Thread extraction
The cocoons are placed into boiling water in order to soften and dissolve the gum that is holding the cocoon together. This is a crucial step in the silk production process as it ensures that there is no damage to the continuity of each thread.
Why does shearing not hurt the sheep?
Because shearing involves in taking out of fleece of the sheep with a thin layer of skin.It does not hurt them because their upper layer of skin is dead.So it is the only reason for that
Differentiate between silk and wool.
Silk and wool are two types of fibers that are obtained from animal sources.
Silk is manufactured from the cocoons of silkworms whereas
wool is manufactured from the fur of furry animals like goats.
What are raw silk and spun silk?
The difference between raw silk and spun silk are-: Raw silk is silk containing a gummy substance called sericin. ...
Spun silk is made from short lengths obtained from damaged coc
