CBSE Class 7 Science Exemplar: Fibre to Fabric NCERT Solutions

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NCERT Solutions PDF Class 7 PDF

This chapter delves into the fascinating world of fibres and fabrics, focusing on animal fibres like wool and silk. The NCERT Solutions for CBSE Class 7 Science Exemplar, Chapter 3, provide clear explanations and answers to multiple-choice questions. Students will learn about the processes involved in obtaining wool from sheep and other animals, including shearing and selective breeding. The solutions also cover the life cycle of the silkworm and the process of sericulture, which leads to the production of silk. Understanding these concepts is crucial for comprehending how everyday fabrics are made from natural sources. These solutions are designed to aid students in grasping the fundamental principles of fibre production and preparing effectively for their exams.

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Quick info

BoardCBSE
ClassClass 7
SubjectScience Exemplar
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 3

Chapter summary

Chapter 3, 'Fibre to Fabric,' focuses on animal fibres. This NCERT Solutions set covers key concepts like sericulture (rearing silkworms for silk) and wool production. It explains the sources of different types of silk and wool, differentiating them from non-fibrous materials. The solutions clarify processes like selective breeding for better wool quality and highlight which animals provide wool, contrasting them with insects like moths. The emphasis is on understanding the origin of these natural fibres and the methods used to obtain them without harming the animals where possible.

Learning outcomes

  • Understand the process of sericulture and its importance in silk production.
  • Identify different types of silk and wool.
  • Explain how wool is obtained from animals like sheep.
  • Differentiate between various animal fibres and non-fibrous materials.
  • Define selective breeding and its role in improving fibre quality.
  • Recognize which animal products are derived from fibres and which are not.

Topics covered

Paper topics

  • Fibre to Fabric
  • Animal Fibres
  • Wool Production
  • Silk Production
  • Sericulture
  • Silkworms
  • Cocoons
  • Selective Breeding
  • Types of Silk
  • Types of Wool
  • Animal Husbandry
  • Natural Fibres

Important topics

  • Sericulture: Rearing of silkworms
  • Wool production process
  • Selective breeding for quality fibres
  • Distinguishing between different animal fibres
  • Ethical considerations in fibre production

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Questions and Solutions

Multiple Choice Questions

1. The rearing of silkworms for obtaining silk is called
  1. cocoon
  2. silk
  3. sericulture
  4. silviculture
Solution: The correct answer is (c) sericulture. Sericulture is the specialized practice of breeding and managing silkworms, primarily for the purpose of harvesting their silk cocoons.
2. Which of the following is not a type of silk?
  1. Mulberry silk
  2. Tassar silk
  3. Mooga silk
  4. Moth silk
Solution: The correct answer is (d) Moth silk. Mulberry silk, Tassar silk, and Mooga silk are all well-known varieties of silk produced by different species of silkworms. 'Moth silk' is not a recognized classification of silk.
3. Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy?
  1. Woollen shawl
  2. Silk scarf
  3. Animal fur cap
  4. Leather jacket
Solution: The most suitable gift for Paheli would be a (a) Woollen shawl. Wool is obtained from the fleece of animals like sheep, goats, and yaks, and the process of shearing does not require killing the animal. Silk is obtained from silkworms, which are killed during the process. Fur caps are made from the fur of animals, which requires killing them. Leather jackets are made from the skin of animals, also necessitating their death.
4. Silk fibre is obtained from
  1. fleece of sheep
  2. cotton ball
  3. cocoon
  4. shiny jute stalk
Solution: Silk fibre is obtained from the (c) cocoon. Silkworms spin cocoons around themselves as part of their life cycle, and these cocoons are made of a continuous thread of silk fibre that can be harvested.
5. Wool fibre cannot be obtained from which of the following?
  1. Goat
  2. Llama
  3. Alpaca
  4. Moth
Solution: Wool fibre cannot be obtained from a (d) Moth. Wool is a fibre derived from the fleece of mammals such as sheep, goats, llamas, and alpacas. Moths are insects and do not produce wool.
6. Selective breeding is a process of
  1. selecting the offsprings with desired properties.
  2. selecting the parents with desired properties.
  3. selecting an area for breeding.
  4. selecting fine hair for good quality wool.
Solution: Selective breeding is the process of (b) selecting the parents with desired properties. This method involves choosing specific animals with advantageous traits to be parents, with the goal of producing offspring that inherit and potentially enhance these desirable characteristics, such as producing finer or softer wool.

Common mistakes

  • Confusing sericulture with silviculture.
  • Incorrectly identifying 'Moth silk' as a type of silk.
  • Not understanding that silk production often involves the death of the silkworm.
  • Confusing animal fur or leather with animal fibres like wool.

Revision tips

  • Focus on the definitions of sericulture and selective breeding.
  • Memorize the animals that provide wool and the sources of different silks.
  • Understand the distinction between fibres obtained with and without harming the animal.
  • Review the explanations for each MCQ to reinforce concepts.

Practice MCQs

Q1. What is the term for the rearing of silkworms to obtain silk?

Q2. Which of the following is NOT recognized as a type of silk?

Q3. Paheli wants to buy a gift made from animal fibre without harming the animal. Which gift is most suitable?

Q4. From where is silk fibre primarily obtained?

Q5. Wool fibre cannot be obtained from which of these?

Q6. What does the process of selective breeding involve?

Frequently asked questions

What is the main focus of CBSE Class 7 Science Exemplar Chapter 3?

Chapter 3, 'Fibre to Fabric,' focuses on animal fibres, primarily wool and silk, explaining their sources, production methods, and related processes like sericulture and selective breeding.

What is sericulture?

Sericulture is the practice of rearing silkworms to obtain silk. It involves managing the silkworms through their life cycle until they produce cocoons from which silk fibre is extracted.

How is wool obtained without harming the animal?

Wool is obtained by shearing the fleece of animals like sheep, goats, and yaks. This process involves cutting the hair, which grows back, and does not require killing the animal.

What is selective breeding in the context of fibre production?

Selective breeding is a method where animals with desirable traits (like soft under-hair for better wool) are chosen as parents to produce offspring with improved qualities.

Are all animal products mentioned in the questions suitable gifts if Paheli wants to avoid harming animals?

No. While woollen shawls are suitable as wool is obtained without killing the animal, silk scarves, fur caps, and leather jackets are generally not, as their production typically involves the death of the animal or insect.

What is the difference between sericulture and silviculture?

Sericulture is the rearing of silkworms for silk production, while silviculture is the practice of cultivating forests or trees.

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