Chhattisgarh State Class 7 Science Chapter 11 Solution

Chhattisgarh State Board Class 7 Science Chapter 11 Fibre to Fabric : Animal Fibre Exercise Multiple Choice, Questions and Answers here.

(1) What is pashmina? From where do you get these fibres?

Answer:- (1) From the soft fleece of kashmiri goat (angora species), a very high quality shawls are made which known as pashmina.

(2) These fibres get in Kashmir.

(2) From which animal do we get wool?

Answer:- Wool is obtained from sheep, goat, yak, camel and some other animal.

(3) Name the different type of silk?

Answer:- The different type of silk are mulberry silk and non-mulberry silk.

(4) What is cocoon?

Answer:- When larva covers itself with silk fibres completely and this stage is known as cocoon.

(1) Identify the true and false statements –

(a) We get wool fro rabbits.

Answer:- True.

(b) Fibres of silk are made of protein.

Answer:- True.

(c) The silk worm produce silk at it maturation stage.

Answer:- True.

(d) Pashmina shawls are made from the hair of camels.

Answer:- False.

(2) Fill in the blanks –

(a) Silk is obtained from ——-.

Answer:- Silk worm.

(b) Making yarns from fibres is known as ——–.

Answer:- Reeling of the silk.

(c) The fluid from the mouth of the ——– harder on exposure to air.

Answer:- Silk worm.

(d) Kosa silk of ——- district is imported to foreign countries.

Answer:- Raigarh.

(3) Match the following:-

(1) Food of the silk worm (b) (a) Shearing
(2) Sheep (c) (b) Mulberry leaves
(3) Cocoon (d) (c) Wool producing animal
(4) Cleaning of wool (a) (d) Stage of larva covered with fibres

 (4) Answer the following

(i) How is wool obtained from fibres? Explain.

Answer:- There are various steps involves to obtain wool from fibres.

(1) Step – 1:- The fleece of sheep along with thin layer of skin is removed from its body. Woollen fibres obtained from these hair are then processed to obtain woollen yarn.

(2) Step -2:- The sheared skin with hair is washed thoroughly in tank to remove grease, dust and dirt this is called scouring.

(3) Step – 3:- After scouring, sorting is done. The hairy skin is sent to a factory where hair of different texture are sorted.

Step – 4:- The small-fluffy fibres, called burrs, are picked out from the hair.

Step – 5:- The fibres are dyed in various colour.

Step – 6:- The fibres are straightened, combed and rollen into yarn. The longer fibres are made into wool.

(ii) Write in brief

(a) Sericulture:-

(i) For obtaining silk, worms are reared, this is known as sericulture.

(ii) The life cycle of all species of silk worm is complete in four stage.

(b) Cocoon:-

(i) The larva covers itself with fibres completely and this stage is known as cocoon.

(ii) Inside the cocoon the larva change to pupa.

(iii) Silk fibres are obtained from the cocoon of the silk moths.

 (c) Reeling:-

(i) The process of spinning of silk yarn from the cocoon is known as reeling of the silk.

(ii) Reeling is done in special machines, which unwind the thread of fibres of silk from the cocoon.

(iii) How is silk fibre made by the silk worm?

Answer:- A special fluid secrete from the mouth of the silk worm, hardness on exposure to air and forms the silk fibre.

(iv) What is Pashmina?

Answer:- From the soft fleece of kashmiri goat (angora species), a very high quality shawls are made which known as pashmina.

(v) Draw the diagram of different stage in the life cycle of Kosa silk worm.

(iv) Which type of silk is available in Chhattisgarh and in which districts?

Answer:- (i) Kosa silk is very popular in Chhattisgarh,

(ii) It has taken the form of industry at korba, Janjgir champa, Jagdalpur, and Raigarh district of Chhattisgarh.

Updated: February 7, 2021 — 1:11 am

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