Fibre and Fabric -NCERT Solutions Class 7 Science Chapter 3 -Worksheet

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CLASS 7 Subject - SCIENCE Chapter name - FIBRE AND FABRIC FIBRE TO FABRIC

Fibre is a natural or man-made substance that is much longer than it is wide. Fabrics are cloth or other material made from woven or knitted fibres.

This worksheet is for class 7 science, comprising the topic of percentage. It is important to understand different types of fibre and fabrics.

After completing this worksheet, students will be able to have a better understanding of the following topics: 1.

2.

3.

4.

5.

What is fibre?

What is the fabric?

What are different types of fibre?

What are the different sources of fibre?

What are the different terms related to fibre?

What is fibre?

Fibre is a natural or man-made substance that is much longer than it is wide. Fibres are frequently utilised to create other materials.

What is the fabric?

Fabrics are cloth or other material made from woven or knitted fibres.

What are different types of fibre?

Different types of fibre are: 1. Natural fibres: Natural fibres are those that are derived from plants, animals, or minerals. Cotton and silk are among the examples.

2. Synthetic fibres: Synthetic fibres, sometimes known as man-made fibres, are fibres created by humans by chemical synthesis as

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opposed to natural fibres, which are derived directly from living things. Eg - Nylon.

1. Classify each of the following fibres as Natural or Synthetic in the table below Sl no. Fibre

Synthetic/Natural

1.

Silk

2.

Nylon

3.

Cotton

4.

Spandex

5.

Wool

2.

Fill the table with the source of the following fibres -

Sl no Fibre 1.

Silk

2.

Wool

3.

Cotton

4.

Jute

5.

Linen

Source

3.

What is rearing?

4.

What is shearing?

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5.

What is sorter’s disease?

6.

What is sericulture?

7.

What is the meaning of “reeling the silk”?

8.

Explain the process of obtaining wool from fibres.

9.

Fill the table with the habitat of the following sheep -

Sl no. Sheep Breed Habitat in India 1.

Marwari

2.

Bakharwal

3.

Lohi

4.

Nali

5.

Patanwadi

Answers

1.

Sl no. Fibre

Synthetic/Natural

1.

Silk

Natural

2.

Nylon

Synthetic

3.

Cotton

Natural

4.

Spandex Synthetic

5.

Wool

Natural

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2.

Sl no Fibre

Source

1.

Silk

Silkworm

2.

Wool

Sheep, Camel

3.

Cotton Plant

4.

Jute

Plant

5.

Linen

Flax

3.

Rearing - It is the process of taking care, feeding, providing medical care and breeding an animal.

4.

Shearing is the process of removing the fleece with a thin layer of skin of the sheep.

5.

Sorter’s disease is a fatal blood disease caused by a bacterium called Anthrax. It is prevalent in the Wool industry.

6.

Sericulture is the process of rearing silkworms to obtain silk.

7.

Reeling silk is the process of taking out threads from the cocoon for use as silk.

8.

Following steps are followed for processing wool: a.

Step 1: Shearing - It is the process of removing the fleece with a thin layer of skin of the sheep. b.

Step 2: Scouring - It is the process of washing sheared hair in tanks to remove the grease, dirt and dust. c.

Step 3: Sorting - It is the process of separating different textures of hair in the factory.

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d.

Step 4: Cleaning of burrs - The process of removing small fluffy fibres from the hair is called cleaning of burrs. The hairs are scoured again. e.

Step 5: Dyeing - Since the original colours of fibres are black, white or brown, dye is applied to the fibres, and this process is called dyeing. f.

Step 6: Rolling - Fibres are straightened, combed and then rolled into a yarn.

9.

Sl no. Sheep breed Habitat in India 1.

Marwari

Gujarat

2.

Bakharwal

Jammu and Kashmir

3.

Lohi

Rajasthan and Punjab

4.

Nali

Rajasthan, Haryana, Punjab

5.

Patanwadi

Gujarat

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