Revision Notes of CBSE Class 7 Science Chapter 3 Fibre to Fabric: Fibre to Fabric Notes PDF for CBSE Class 7 Science is now available on SpeEdLabs. The third chapter of the Class 7 Science syllabus focuses on Fibre and Fabric. The purpose of this chapter is to provide a comprehensive understanding of how fabrics are made from various fibres. The chapter also discusses how various fibres are obtained from plants and animals. Each of the topics and subtopics covered in this chapter has been summarized in a point-by-point manner by our subject experts.

Key Topics from CBSE Class 7 Science Chapter 3 Fibre to Fabric

The below list shows the topics and sub-topics covered in the CBSE Class 7 Science Chapter 3 Fibre and Fabrics.

Fibres from Plants
Jute
Basics of Fabric

Fibres
Fibre to Yarn to Fabric
Cotton and Its Processing

Fibre from Animals

Wool (Wool from Animals)
Rearing and Breeding of Sheep for Wool
Processing fibres into wool

Occupational Hazards of Fibre Production
Silk

Silk from Animals
Development of Silk Moth
Sericulture
Processing Silk Obtained from Cocoons

Natural Fibres Vs. Synthetic Fibres

Natural Fibres
Synthetic Fibres

CBSE Class 7 Science Chapter 3 – Fibre to Fabric Notes

Fibres are the long, fine, continuous threads or filaments which are obtained from plants and animals.

There are two types of fibres generally found:

Animal fibre
Plant fibres

Silk and Wool are common animal fibres.

Silk is obtained from silkworms whereas wool is obtained from yak (Found in Tibet and Ladakh), sheep, Angora goat, goat, camels, llama and Alpaca (Found in South America). Wool is obtained from either fleece or hair of these animals. Therefore, silk and wool are examples of animal fibres. The hairs of camel, llama and alpaca can also be processed in order to yield wool. In India, wool is mostly reared from sheep. Sheep hair is first sheared off from the body, then goes into a series of processes from scoured, sorted, dried, dyed, spun and woven to yield wool.

Wool:

Sources of Wool: Obtained from yak (Found in Tibet and Ladakh), sheep, Angora goat, goat, camels, llama and Alpaca (Found in South America).

Obtaining Wool Fibre:

The process of removal of fleece of the sheep along with a very thin layer of skin is called shearing.

Processing of Wool Fibre:

Scouring: Sheared hair from sheep is cleaned and now washed in tanks to remove grease, dust and dirt.
Sorting: Cleaned hairs are taken to a factory where these hair of different quality are also separated.

iii. The hair separated in the sorting process is sent into a ‘Carding’ machine where these loose wool fibres are combed into a sheet and then twisted into a rope or silver.

iv. This silver is then twisted and stretched into a yarn.
v. The yarn is now wound to form big balls of wool.

Silk:

Sericulture is the process of breeding and raising silkworms to obtain silk. Silkworms are caterpillars of silk moths.

The Life Cycle of Silkworms:

During its life cycle, the worms start spinning cocoons of silk fibres. Silk fibres are made up of protein. The Silk fibres obtained from cocoons are further separated out and reeled into silk threads. These silk threads are sent to weavers who weave silk threads into silk cloth. When the eggs of the silk moth hatch, larvae are produced known as Caterpillar or Silkworms. The next stage of the caterpillar’s life is known as Pupa. The Caterpillar turns into a silk moth and the covering is called a cocoon. The caterpillar covers itself into silk and turns itself into Pupa.

Class 7 Science Chapter 3 Free PDF Notes

We have provided our Class 7 Science Chapter 3 notes in PDF format for the students’ convenience. The Class 7 Chapter 3 Science notes are accessible from any device at any time. It is possible for them to download the notes in PDF format and revise all the lessons in offline mode or take a printout of the notes to carry with them everywhere. We have designed the PDF notes of Chapter 3 Science Class 7 in the most comprehensible language to build a strong foundation in the subject, which will benefit the students in the future.

Fibre to Fabric Class 7 Revision Notes Overview

The Fiber to Fabric Class 7 notes will include the following sections in complete accordance with the NCERT pattern as prescribed by CBSE:

Definition and Types of Fibres: The following section will focus on introducing the students to Fibres and its types.

Fibres are thin strands that are used for the production of fabric. The fibres are spun to form a yarn, which is then converted into a fabric by weaving on a loom.

Examples of fibres include wool, cotton, silk, jute, nylon, and polyester.

There are majorly two types of fibres that will be covered in Chapter 3 Class 7 Science notes:

Natural Fibres: As the name suggests, natural fibres are those types of fibres that are obtained from natural sources, namely, plants and animals.

Examples of some fibres that are obtained from plants are cotton and jute. While silk and wool are examples of animal fibres.

Synthetic Fibres: Synthetic fibres include those fibres that are man-made and cannot be found in nature. Its examples include rayon, polyester, acrylic, etc.

Plant Fibres: In the section of Fiber to Fabric Class 7 notes, students will learn in detail about different plant fibres and how they are used to produce fabrics.

Cotton: Cotton is a plant fiber that is obtained from the cotton plant. It is cultivated best in places with black soil and a warm climate. The fruits of the cotton plant through which cotton is obtained are called cotton bolls. The method by which the cotton fibres are separated from the seeds is called Ginning.
Jute: The stem of the jute plant is the main source of jute fiber. It is mainly cultivated during the rainy seasons in areas of Assam, West Bengal, and Bihar. Jute plants are usually harvested at the flowering stage, and the stems are soaked in water to rot. The jute fibres are separated from the rotten stems by hand.

Animal Fibres: Students will learn in detail about the following animal fibres and how they are obtained in this section of Class 7th Science Chapter 3 notes.

Silk: Silk is an animal fiber that is obtained from an insect called a silk moth. Sericulture is the process of cultivating silk. During its life cycle, a silkworm secretes fibres of proteins that harden in contact with the air and transform into silk fibres. The covering of silk fibres around the pupa is called a cocoon. These silk fibres are then separated from the silk moths and converted into silk thread.
Wool: Wool is sourced from many animals like goat, sheep, yak, camel, etc. Shearing is the procedure by which the fleece of the sheep or yak is removed to obtain wool fiber. The different steps that are involved in the processing of wool fiber are shearing, grading, carding, and spinning.

Yarn: Our notes of Class 7 Science Chapter 3 will also cover the details of the making of yarn from different fibres and how to convert the yarn into a fiber.

The Spinning of Cotton Yarn: Spinning is the process of making yarn from fiber. The various devices that are used for spinning a cotton yarn from cotton fibres are takli and charkha. To produce yarn on a large scale, spinning machines are used.
Processes That are Used to Make Fabrics From Yarn: The two main ways by which fabrics are produced from yarn are weaving and knitting. Weaving is a process that includes two sets of yarn that are involved in producing a fabric, while in knitting, a single yarn is used to produce a fabric of the cloth. Weaving is done with the help of looms, and knitting is done either by hands or machines.

Benefits of SpeEdLabs’ Class 7 Science Chapter 3 Fibre to Fabric Revision Notes

SpeEdLabs provides the Class 7 Science Chapter 3 revision Notes for the last-minute revision purposes of students. These notes are prepared by our subject matter experts who have highlighted the key points under each topic covered in this chapter.
Using proper terminology and labelled diagrams, the steps involved in making fabric from different fibres are explained in detail. Thus, students will be able to figure out the correct way of answering the questions asked in the exam from this chapter by studying these notes.
Definitions of plant fibres, synthetic fibre, the life cycle of silk worms, etc. are explained under separate headings in these notes PDF, thereby making it easier to learn and revise for students. This concise format of the CBSE Class 7 Fibre and Fabric revision notes makes it less time-consuming for students to revise this chapter before the exam.

Also Read –

Also published on Medium.

Fibre to Fabric: Class 7 Chapter 3 Science Notes