FIBRE TO FABRIC
ACTIVITY- 3.1 : To know about the hairs of some animals.
Question 1- Name any two natural fibres obtained from plants.
Answer- Cotton and jute.
Question 2- Name any two natural fibres obtained from animals.
Answer- Wool and silk.
Question 3- Name any three animals which provide us wool.
Answer- Sheep, goat, camel and yak.
Question 4- Why do some animals have a thick coat of hairs?
Answer- Hairs trap a lot of air. Air is a poor conductor of heat, so it does not allow the body heat to escape and keep the body warm.
ACTIVITY- 3.4 : Burn test for Natural and Synthetic fibres.
Question 1- What difference in smell you notice on burning silk thread, artificial silk thread and wool?
Answer- Smell of burning thread of artificial thread is like burning of paper. But smell of burning of thread of silk and wool is like burning of hairs.
Question 2- What type of ash is formed in the above activity?
Answer- Artificial silk is converted into soft black ash on burning, while silk and wool is converted into dark brittle and easily crushable bead.
Question 3- Does the smell of burning of silk thread is same as the smell of burning woolen thread?
Answer- Yes.
EXERCISE
Question 1- Fill In The Blanks.
(i). Wool is obtained from the fleece (hair) of sheep, goat and yak
(ii). Long hair on the body protect animals from winter.
(ii). Removal of fleece from the skin of animal is called Shearing.
(iv). Rearing of silkworm is called Sericulture.
(v). The process of unwinding the filaments from the boiled cocoons, is called Reeling.
Question 2- Match The Following :
Question 3. Choose The Correct Answer.
(i). The fibre which is not produced by animals :
a) Angora Wool
b) Wool
c) Jute (✓)
d) Silk
(ii). Wool is commonly obtained from :
a) Sheep
b) Goat
c) Yak
d) All of the above (✓)
(iii). Washing of sheared hair is called :
a) Scouring (✓)
b) Sorting
c) Shearing
d) Dyeing
(iv). Wool is chemically :
a) Fat
b) Protein (✓)
c) Carbohydrate
d) None of these
(v). The animal that does not yield wool is :
a) Alpaca
b) Woolly dog (✓)
c) Camel
d) Goat
Question 4- Write True Or False.
(i) Air is bad conductor of heat. (True)
(ii) Air trapped in long hair does not allow body heat to escape from body. (True)
(iii) In Tibet and Ladakh, wool is obtained from yak. (True)
(iv) Rearing of silk moths is called apiculture. (False)
(v) The cover around the body of caterpillar is called cocoon. (True)
(vi) Tassar silk and moonga silk are produced by silk moth who have been feeding on non-mulberry trees. (True)
Question 5- Very Short Answer Type Questions.
(i) Name any two plant fibres and animal fibres.
Answer- Plant fibres- Cotton, jute.
Animal fibres- Wool and silk.
(ii) What is sericulture?
Answer- Rearing of silkworms for production of silk is known as sericulture.
(iii) Name the common animals who yield fleece.
Answer- Sheep, goat, yak and camel.
Question 6- Short Answer Type Questions.
(i) What you understand by Angora and Kashmere wool?
Answer- Angora wool is obtained from Angora goats found in hilly regions such as Jammu and Kashmir,while Kashmiri wool is obtained from Kashmiri goat.
(ii) Write the states where the following breeds of sheep are found:-
Lohi, Bakharwal, Nali and Marwari.
Answer- Lohi- Rajasthan, Punjab.
Bakharwal- Jammu and Kashmir.
Nali- Rajasthan, Hariana, Punjab.
Marwari- Gujarat.
(iii) Write all the steps involved in processing of fibres into wool.
Answer- (1) Shearing, (2) Scouring, (3) Sorting, (4) Combing, (5) Dyeing, (6) Spinning.
(iv) Why do some animals have a thick coat of hair.
Answer- Hairs trap a lot of air. Air is a poor conductor of heat, so it does not allow the body heat to escape and keep the body warm.
(v) How is silk moth reared?
Answer- Eggs of silk moth are stored carefully on strips of cloth or paper and sold to silkworm farmers. The farmers keep eggs under hygienic conditions, under suitable temperature and humidity. The eggs are warmed to a suitable temperature for the larvae to hatch from eggs when mulberry trees bear a fresh crop. The worms are kept in bamboo trays along with mulberry leaves. By eating leaves larvae change into caterpillar, then caterpillar into cocoons. The farmers get silk fibres from cocoon.
Question 7- Long Answer Type Questions.
(i) Write all the steps in processing silk from cocoons.
Answer-
(1) Boiling- The cocoons are boiled in hot water to kill larvae and to soften the silk gum.
(2) Reeling- The process of taking out threads from the cocoon for use as silk is called reeling the silk. This is done with special machines.
(3) Throwing- In this process the raw silk is twisted to produce thrown silk.
(4) Dyeing- In the end silk is dyed for making colorful fabrics.
(ii) Draw a well labeled diagram and explain the life cycle of silk moth.
Answer- (1) The female silk moth lay eggs on the leaves of mulberry trees.
(2) The eggs hatch larvae in two weeks to form worm like structures which are called caterpillars or silkworms. They eat leaves and grows to become pupa.
(3) To protect itself pupa secretes fibre made of protein and rotates its mouth in the shape of 8. Hence a cocoon made of silk fibre is constructed around the moth
More question-
Q 1: Name the following:
a) The thin strands of thread, that are made up of still thinner strands are called --------------.
b) Cotton is grown in --------------------------------------- soil.
c) Weaving of fabric is done on ---------------------------------.
d) Jute plant is harvested at ---------------------------------- stage.
e) Silk fibre is drawn from the --------------------------- of silk worms.
f) ----------------------- and --------------------------- are the ways used to make different kinds of fabrics.
g) Jute plant is cultivated during --------------------------- season.
h) ---------------, ------------------ and -------------------------- are plant fibres.
i) ----------------- and -------------------- are hand operated devices used for spinning.
Q 2 Define the following:
a) Ginning---------------------------------------------------------------------------------------------------
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b) Spinning : -----------------------------------------------------------------------------------------------
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Q 3 Distinguish between natural fibres and synthetic fibres . Give examples for each.
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Q 4 Distinguish between weaving and knitting.
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Q 5 Boojho with perfect eyesight was finding it difficult to pass a thread through the eye of a needle. What can be the reason for this?
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Please click on below link to download CBSE Class 6 Science Fibre To Fabric Worksheet Set B
