A. Fill in the blanks
1. The hairy body coat of sheep and goat is called fleece.
2. Shaving off the body coat of sheep is called shearing.
3. Cleaning of fleece to remove dirt and grease is called scouring.
4. The process of separating hair of different textures from the fleece is called sorting.
5. The rearing of silkworms to obtain silk is called sericulture.
6. Reeling is the process of separating silk fibres from cocoons.
7. The silk thread is made up of protein fibres.
B. Write True or False:
1. Synthetic fibres are manufactured in factories. True
2. Air is a good conductor of heat. False
3. Scouring is the process of removal of fleece of sheep. False
4. The process of twisting of raw and dyed fibre is known as sorting. False
5. Silkworms feed on mulberry leaves. True
6. The larvae secrete very fine filaments made of protein. True
7. Reeling is the process of getting silk fibres from cocoons. True
C. Tick (✔) the correct option:
1. The process of removing fleece along with a thin layer of dead skin is called
✔ Shearing
2. Which of the following animals does not yield wool?
✔ Buffalo
3. The caterpillars of silkworms feed on
✔ Mulberry leaves
4. The egg of a silk moth hatches into a
✔ Larva
5. The process of taking out silk threads from the cocoon is called
✔ Reeling
D. Answer the following questions in brief:
1. Name three animals whose fleece is used for making woollen fibres.
Ans: Sheep, Goat, Yak
2. Name three common varieties of wool.
Ans: Merino, Kashmiri wool, Angora wool
3. Meaning of the term sorting
Ans: Sorting is the process of separating fibres of different textures from the fleece.
4. Define sericulture?
Ans: Sericulture is the rearing of silkworms to obtain silk.
5. How is silk fibre obtained from cocoon?
Ans: Silk fibres are obtained by boiling the cocoons and then reeling out the silk threads.
6. Name two countries where silk is produced on a large scale.
Ans: India, China
E. Answer the following questions :
1. How do woollen clothes keep us warm in winter?
Ans: Woollen clothes trap air between their fibres. Since air is a poor conductor of heat, it prevents body heat from escaping and keeps us warm.
2. Describe the purpose of 'scouring' in the production of wool?
Ans: Scouring removes dirt, grease, sweat, and dust from the fleece to make it clean and suitable for spinning.
3. State the practical uses of the (a) long (b) short yarn threads, obtained during the making of wool.
Ans: (a) Long yarn threads: Used for making sweaters, shawls, blankets
(b) Short yarn threads: Used for carpets, rugs, and coarse fabrics
4. Write a short note on 'rearing of silkworms'.
Ans: Silkworms are reared by keeping silk moth eggs in a clean environment. The larvae feed on mulberry leaves, grow, and spin cocoons made of silk threads. These cocoons are then processed to obtain silk.
5. Describe the different stages in the life cycle of a silk moth.
Ans: 1. Egg
2. Larva (silkworm/caterpillar)
3. Pupa (inside cocoon)
4. Adult silk moth
Value Based Questions
1. Three values Madam Sevika must have held
(i) Dedication
(ii) Selfless service
(iii) Compassion for society
2. Role of silkworms in silk production
Silkworms spin cocoons made of silk fibres, which are processed to obtain silk threads.
Something To Do (Project Answers – Short Guide)
1. (a) Breeds of sheep in India
Lohi – Rajasthan, Punjab
Rampur Bushair – Himachal Pradesh
Nali – Rajasthan
(b) Wool-yielding animals in other countries
Alpaca – South America
Merino sheep – Australia
Angora goat – Turkey
(c) Hazards in wool and silk industry
Skin allergies
Breathing problems
Injuries from machines
2. Varieties of silk in India
Mulberry silk
Tassar silk
Eri silk
Muga silk
Traditional silk sarees
Kanchipuram – Tamil Nadu
Banarasi – Uttar Pradesh
Patola – Gujarat
Muga – Assam
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