Class 7 Science

Chapter 3: Fibre to Fabric

STAGE 0: Foundation / Basics

Clothes we wear are made from fabrics. Fabrics are made from fibres.

Fibres are thin, hair-like structures.

Examples of fibres: Cotton, Wool, Silk, Jute

STAGE 1: Types of Fibres

Fibres are of two main types:

• Natural Fibres
• Synthetic Fibres

Natural Fibres

Natural fibres are obtained from plants and animals.

Examples:

• Cotton – obtained from cotton plant
• Jute – obtained from jute plant
• Wool – obtained from sheep
• Silk – obtained from silkworm

Wool

Wool is obtained from the hair of animals like sheep, goat, and yak.

Steps involved in making wool:

1. Shearing – removal of hair
2. Scouring – washing the hair
3. Sorting – separating fibres
4. Dyeing – adding colour
5. Spinning – making yarn

Silk

Silk is obtained from silkworms.

The process of obtaining silk from silkworms is called Sericulture.

Life cycle of silkworm:

• Egg
• Larva (Silkworm)
• Pupa
• Adult moth

STAGE 2: NCERT Textbook Questions & Answers

Q1. What are fibres?

Fibres are thin, hair-like structures used to make fabrics.

Q2. Name two natural fibres.

Cotton and wool.

Q3. What is sericulture?

Sericulture is the rearing of silkworms to obtain silk.

STAGE 3: Exam-Oriented Questions

Fill in the blanks:

• Wool is obtained from the hair of sheep.
• Silk fibre comes from silkworm.

Very Short Answer:

Name the process of removing hair from sheep.
Answer: Shearing

Quick Revision Points

• Fibres make fabrics
• Natural fibres come from plants and animals
• Wool comes from sheep
• Silk comes from silkworm