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Class 7 Science Question Answers - Fibre to Fabric

Short Answer Type Questions

Q1: What are natural fibres? Give example.

Ans: The fibres of some fabric are obtained from plants and animals. These are called natural fibres. For example: cotton, jute, silk etc are natural fibres.

CottonCotton

Q2: Which of these are natural fibres –

Silk, Nylon, Wool, Polyester, Cotton

Ans: Silk, Wool and Cotton, all are natural fibres.

Q3: Write the difference between natural and synthetic fibres.

Ans: The fibres of some fabric are obtained from plants and animals. These are called natural fibres. For example-cotton, jute, silk etc. The fibres that are made from chemical substances are called synthetic fibres. For example-nylon, polyester etc.


Q4: What is ginning?

Ans: Cotton fibres are separated from the seeds by combing. This process is known as ginning. Machines are also now used for ginning.


Q5: Define weaving.

Ans: The process of arranging two sets of yarns together to make a fabric is called weaving. Weaving of fabric is done on looms.


Q6: What happens after maturing of fruit of cotton plant (cotton bolls)?

Ans: After maturing, the bolls burst open and seeds covered with cotton fibres can be seen. Then the cotton can be picked.


Q7: How is spinning done on large scale?

Ans: Spinning is done on large scale with the help of spinning machines. After spinning yarns are used for making fabric.


Q8: Where does cotton wool come from?

Ans: Cotton wool is grown in fields. Plants are grown at places having black soil and warm climate.


Q9: What will happen if we pull the yarn from torn pair of socks? Why so?

Ans: A single yarn gets pulled out continuously as the fabric gets unravelled. It is because they are made of knitted fabric.


Q10: What are looms?

Ans: Looms are those on which weaving of fabric is done. They are either hand operated or power operated.


Q11: Choose the correct option-
1. Cotton is obtained from ____________of plant. (seed/stem)
2. Nylon is ____________fibre.(natural/synthetic)
3. Jute is obtained from ____________. (plant/animal)
Ans:
a) Seed.
b) Synthetic.
c) Plant.


Q12: Match the correct option-

Column A
Column B
  1. Silk
  2. Charkha
  3. Polyester
  4. Jute
  1. Synthetic fibre
  2. Plant fibre
  3. Animal fibre
  4. Spinning

Ans:  
Silk- Animal fibre
Charkha - Spinning
Polyester - Synthetic Fibre
Jute - Plant Fibre


Long Answer Type Questions

Q1: What is done in the process of spinning? Name any device used for spinning.

Ans: The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form a yarn. A device used for spinning is charkha.

Class 7 Science Question Answers - Fibre to Fabric

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FAQs on Class 7 Science Question Answers - Fibre to Fabric

1. What is fibre to fabric?
Ans. Fibre to fabric refers to the process of converting natural or synthetic fibres into usable fabrics. It involves several steps including harvesting or extracting fibres, cleaning them, spinning them into yarn, and then weaving or knitting the yarn to create fabric.
2. What are the different types of fibres used in fabric production?
Ans. There are two main types of fibres used in fabric production - natural fibres and synthetic fibres. Natural fibres include cotton, silk, wool, and linen, which are sourced from plants or animals. Synthetic fibres, on the other hand, are man-made and include materials like polyester, nylon, and acrylic.
3. How are natural fibres obtained?
Ans. Natural fibres are obtained from various sources. Cotton fibres come from the cotton plant's seed pods, while silk is obtained from the silkworm's cocoon. Wool is derived from the fleece of sheep or other animals like goats, alpacas, or rabbits. Linen fibres are obtained from the flax plant's stem.
4. What is the process of making yarn from fibres?
Ans. The process of making yarn from fibres involves spinning. In this process, the fibres are first straightened and aligned. Then, they are twisted together to form a continuous strand of yarn. This can be done using a spinning wheel or a spinning machine.
5. How are fabrics made from yarn?
Ans. Fabrics are made from yarn through the processes of weaving or knitting. In weaving, the yarns are interlaced at right angles to form a fabric. This is done on a loom, where vertical yarns, called warp, are held taut while horizontal yarns, called weft or woof, are woven through them. Knitting, on the other hand, involves interlocking loops of yarn to create a fabric.
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