CBSE Class 7 Science Chapter 3 Fibre to Fabric NCERT Solutions
CBSE Class 7 Science Chapter 3 introduces the diverse world of fibres and fabrics, with a special focus on wool and silk. This chapter explores the origins of these essential materials, detailing how wool is obtained from animals like sheep and yaks through processes such as rearing and shearing. It also examines the intricate life cycle of the silkworm, which is crucial for silk production, a practice known as sericulture. The chapter further elaborates on the steps involved in transforming raw fibres into usable fabrics, including scouring. Understanding these processes is key to appreciating the journey from animal or insect to the clothes we wear. This foundational knowledge in textile science is vital for students' academic growth and exam readiness.
Quick info
| Board | CBSE |
|---|---|
| Class | Class 7 |
| Subject | Science |
| Session | 2026 |
| Language | English |
| Type | NCERT Solutions |
| Chapter | Chapter 3 |
Chapter summary
Chapter 3, 'Fibre to Fabric,' for CBSE Class 7 Science, focuses on the sources of fibres used to make clothing. This chapter's NCERT Solutions cover the processing of wool from sheep and other animals, including rearing and shearing. It also details the life cycle of the silkworm and the process of sericulture for silk production. The solutions explain key terms and steps involved in transforming fibres into yarn and fabric.
Learning outcomes
- Understand the sources of wool and silk.
- Explain the process of obtaining wool from sheep.
- Describe the life cycle of a silkworm.
- Define key terms like rearing, shearing, and sericulture.
- Identify the steps involved in wool processing.
- Differentiate between various animal fibres.
Topics covered
Paper topics
- Animal Fibres
- Wool Production
- Sheep Rearing
- Shearing
- Scouring
- Sorting
- Silk Production
- Silkworm Life Cycle
- Sericulture
- Fibre to Fabric
- Processing of Wool
- Types of Silk
Important topics
- Wool Production Process
- Silkworm Life Cycle
- Sericulture
- Key Terms: Rearing, Shearing, Scouring
- Sources of Wool
PDF preview
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Questions and Solutions
Question 1
- 'Baa baa black sheep, have you any wool.'
- 'Mary had a little lamb, whose fleece was white as snow.'
- Which parts of the black sheep have wool?
- What is meant by the white fleece of the lamb?
- Wool is obtained from the fleece of sheep, which consists of the fine, soft under-hair that grows close to the skin.
- The 'white fleece of the lamb' refers to the woolly coat of the lamb, which is naturally white in colour. The colour of the fleece can vary, with natural colours including black, brown, and white.
Question 2
- a
- b
- both a and b
- neither a nor b.
The correct option is (iii) both a and b. A silkworm is indeed a caterpillar, and in biological terms, a caterpillar is the larval stage of an insect. Therefore, it is both a caterpillar and a larva.
Question 3
- Yak
- Camel
- Goat
- Woolly dog
The correct answer is (iv) Woolly dog. Yaks, camels, and goats are animals that yield wool or fibres used for making fabrics. Woolly dogs, however, are not typically known for producing wool used in textiles.
Question 4
- Rearing
- Shearing
- Sericulture
Rearing: Rearing refers to the process of raising and managing livestock, such as sheep, goats, and cattle. This involves providing them with proper food, shelter, and care to ensure their health and productivity, which can include yielding products like milk, meat, or wool.
Shearing: Shearing is the process of removing the woolly fleece from an animal, typically a sheep. This is done by cutting the fleece off with sharp blades or machines, usually once a year, to obtain the wool fibre. A thin layer of skin is left behind to protect the animal.
Sericulture: Sericulture is the practice of cultivating silkworms and raising them for the purpose of producing silk. It involves managing the silkworms through their life cycle, from eggs to the spinning of cocoons, which are then processed to extract silk threads.
Question 5
Shearing, _____, sorting, _____, ____, ____.
The complete sequence of steps in the processing of wool is:
Shearing, scouring, sorting, carding, spinning, weaving.
Explanation of missing steps:
- Scouring: After shearing, the fleece is washed to remove dirt, grease, and impurities.
- Carding: The cleaned fibres are then straightened, aligned, and slightly twisted to form slivers, which are preparatory to spinning.
- Spinning: The slivers are drawn out and twisted further to form yarn or thread.
- Weaving: The yarn is then woven into fabric.
Question 6
The two stages in the life history of the silk moth that are directly related to the production of silk are:
- The Larva (Caterpillar): This is the stage where the silkworm actively feeds, usually on mulberry leaves. It grows rapidly and eventually spins a protective cocoon around itself.
- The Cocoon: The cocoon is the protective casing spun by the silkworm larva using a continuous thread of raw silk. This cocoon is what is harvested and processed to extract the silk fibre.
(Note: Sketches are not possible in this text format, but students should draw a silkworm caterpillar and a cocoon.)
Common mistakes
- Confusing the stages of the silkworm life cycle.
- Misunderstanding the difference between shearing and scouring.
- Incorrectly identifying animals that yield wool.
- Not knowing the specific terms related to silk production.
Revision tips
- Review the definitions of key terms like rearing, shearing, and sericulture.
- Trace the complete process of wool production from sheep to yarn.
- Memorize the stages of the silkworm's life cycle relevant to silk production.
- Pay attention to the specific animals mentioned as sources of wool.
Practice MCQs
Q1. What is the primary product obtained from sheep?
Explanation: Sheep are primarily raised for their wool, which is a fibre used to make clothing and other textiles.
Q2. Which of the following is the process of cutting off the fleece of sheep?
Explanation: Shearing is the term for the process where the woolly coat of a sheep is cut off.
Q3. The breeding and management of silkworms for silk production is called:
Explanation: Sericulture is the specialized practice of raising silkworms to produce silk.
Q4. Which stage of the silkworm is directly related to silk production?
Explanation: The larva, also known as the caterpillar or silkworm, spins a cocoon of silk thread around itself.
Q5. Which animal, besides sheep, is mentioned as a source of wool?
Explanation: The chapter mentions that yaks also provide wool, particularly in colder regions.
Frequently asked questions
What is the main topic of CBSE Class 7 Science Chapter 3?
Chapter 3 of CBSE Class 7 Science focuses on 'Fibre to Fabric,' explaining the origins of wool and silk from animals and the processes involved in their production.
What does 'rearing' mean in the context of wool production?
Rearing refers to the process of raising and taking care of livestock, such as sheep, for commercial purposes, including the production of wool.
What is shearing and when is it done?
Shearing is the process of cutting off the thick coat of wool from a sheep. It is typically done once a year when the sheep's fleece has grown sufficiently.
What is sericulture?
Sericulture is the practice of breeding and managing silkworms to produce silk.
Which animals are mentioned as sources of wool in this chapter?
The chapter mentions sheep and yaks as sources of wool. It also implies other animals like camels might yield fibres used for clothing.
How do these NCERT Solutions help students?
These solutions provide clear, step-by-step explanations for all questions in Chapter 3, helping students understand the concepts of fibre production and prepare effectively for their exams.
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