Chapter 3 – Fibre to fabric

These NCERT Class 7 Science Chapter 3 notes explain how clothes are made from fibres obtained from animals. The chapter introduces animal fibres such as wool and silk and explains their sources and uses in daily life.

Fibre to Fabric describes sheep rearing, processing of wool, life cycle of silkworm, and the process of making silk. This chapter helps students understand how raw materials are converted into useful products through different stages.

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1. Introduction: why fibre to fabric matters

•  Clothes are made from fabrics, and fabrics are made from fibres.
•  Fibres mainly come from plants and animals.
•  This chapter focuses on animal fibres like wool and silk.
•  Many people and processes are involved before clothes reach us.
•  The basic journey is animal → fibre → yarn → fabric → clothes.

2. Animal fibres

•  Animal fibres are fibres obtained from animals.
•  Wool is obtained from sheep and similar animals.
•  Silk is obtained from the silkworm.
•  Animal fibres are used to make warm and strong fabrics.
•  They are important for clothing and employment.

3. Wool: source

•  Wool is obtained from the hair of animals.
•  Sheep are the main source of wool.
•  Other wool-giving animals include goat, yak, camel, llama, and alpaca.
•  Wool is produced mainly in cold and hilly regions.
•  In India, major regions are Jammu & Kashmir, Himachal Pradesh, Uttarakhand, and Rajasthan.

4. Sheep rearing

•  Sheep rearing is done for wool and meat.
•  Sheep need proper food, shelter, and health care.
•  Sheep hair has two layers.
•  Coarse hair forms the outer layer and protects the sheep.
•  Fine soft hair forms the wool used for clothes.

5. Steps in processing wool

•  Shearing is the removal of fleece from sheep without harming them.
•  Scouring is washing the fleece to remove dirt and grease.
•  Sorting separates fibres based on quality and length.
•  Dyeing adds colour to the fibres.
•  Spinning twists fibres to form yarn, like preparing thread from cotton.

6. Occupational hazard: sorter’s disease

•  Workers handling raw wool may get infected.
•  Sorter’s disease is caused by bacteria.
•  It mainly affects the lungs and causes breathing problems.
•  This shows the need for safety measures in industries.
•  Protective steps are important for worker health.

7. Silk: source

•  Silk is obtained from the silkworm.
•  Silkworms feed on mulberry leaves.
•  Silk fibre comes from the cocoon spun by silkworms.
•  Silk is known for its smoothness and shine.
•  It is widely used in clothing.

8. Life cycle of silkworm

•  The life cycle begins with the egg stage.
•  The larva stage is called the silkworm.
•  The larva changes into the pupa stage.
•  Finally, it becomes an adult moth.
•  The larva stage produces silk by spinning a cocoon.

9. Rearing of silkworms (sericulture)

 Sericulture means rearing silkworms to obtain silk.
 It needs proper temperature, cleanliness, and care.
 India is one of the largest producers of silk.
 Major silk-producing states include Karnataka and Assam.
 West Bengal and Tamil Nadu also produce silk.

10. Making of silk

•  The silkworm spins a cocoon around itself.
•  The cocoon is made of a long silk thread.
•  Cocoons are boiled to separate silk fibres.
•  Fibres are then spun into yarn.
•  One cocoon gives one long continuous thread.

11. Types of silk

•  Mulberry silk is the most common silk.
•  Tassar silk is obtained from forest silkworms.
•  Eri silk is soft and warm.
•  Muga silk is found mainly in Assam.
•  Each type has its own quality and use.

12. Silk: special properties

•  Silk is smooth and shiny.
•  It is a strong natural fibre.
•  Silk clothes are comfortable to wear.
•  Silk is costly due to careful processing.
•  Production involves skilled labour.

13. Importance of wool and silk

•  Wool and silk are used to make clothes.
•  Wool keeps the body warm.
•  Silk is used for special and festive wear.
•  These fibres support rural livelihoods.
•  They are important for the textile industry.

14. Environmental and economic aspect

•  Sheep rearing provides income to farmers.
•  Sericulture supports small and marginal farmers.
•  Both are cottage industries in India.
•  They create employment in rural areas.
•  They contribute to the local economy.

15. Important keywords with simple definitions

•  Fibre – thin thread-like material used to make fabric.
•  Fabric – cloth made from fibres.
•  Fleece – hair removed from sheep.
•  Shearing – cutting off fleece from sheep.
•  Scouring – washing wool to remove dirt and grease.
•  Sericulture – rearing silkworms for silk production.

Understanding NCERT Class 7 Science Chapter 3 – Fibre to Fabric is important to learn how natural fibres like wool and silk are produced and processed. The chapter also highlights the economic importance of animal fibres and rural livelihoods.

The concepts discussed are useful for school examinations and foundation-level science preparation. Students should next read Chapter 4: Heat to understand temperature, transfer of heat, and effects of heat in daily life.

FAQs

Q1. What is explained in NCERT Class 7 Science Chapter 3?
The chapter explains animal fibres, wool and silk production, and the process of converting fibres into fabric.

Q2. What are animal fibres?
Animal fibres are fibres obtained from animals, such as wool from sheep and silk from silkworms.

Q3. What are the main steps in processing wool?
The steps include shearing, scouring, sorting, dyeing, and spinning.

Q4. What is sericulture?
Sericulture is the rearing of silkworms for the production of silk.

Q5. Why is NCERT Class 7 Science Chapter 3 important for exams?
It explains fibre production and processing, which are common topics in school and foundation-level exams.

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