1. (a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)
  2. (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
  3. (a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)
  4. (a) - (i), (b) - (iii), (c) - (iv), (d) - (ii)
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1 Answers

Option 2 : (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

Concept : 

  •  Fibres are defined as thread-like structures that are thin, long and flexible strands.
  • The two main sources of fibres are Plants and Animals.
  • Plant fibres are obtained from plants sources like cotton, jute, bamboo, coconut tres, flax seeds, vegetable fibres, wood, grains etc.

Explanation : 

Cotton :

  • Cotton is a soft fibre that is obtained from cotton plants and grows as a ball.
  • Cotton is basically grown in Maharashtra, Rajasthan, Madhya Pradesh, Gujrat etc.
  • When cotton plants start flowering, yellowish-white flowers grow and after a few days, they turn red in colour.
  • Later on, flowers change into cotton balls.

Flax :

  • Flax also known as linseed with the binominal name Linum usitatissimum, is a member of the genus Linum in the family Linaceace.
  • It is a food and fibre crop grown in cooler regions of India.
  • Flax fibre is extracted from the skin of the stem of the plant.
  • Flax fibre is soft, lustrous and flexible, bundles of fibre that look like blonde hair.
  • It is stronger than cotton fibres but less elastic.

Silk :

  • Silk is a natural protein fibre, some forms of which can be woven into textiles.
  • The protein fibre of silk is composed mainly of fibroin and is produced by silkworms larvae to form cocoons.
  • The caterpillar/ silkworm secretes fibre made up of a protein which gets hardened on being exposed to air and becomes silk fibres
  • Silkworm completely covers itself with silk fibres and this covering is called a cocoon, which is further processed to obtain silk fibres.

Coconut fibre :

  • Coconut fibre (coir) is a natural fibre obtained from the husk or the mesocarp of coconut ) cocus Nucifera).
  • The fibre is typically golden colour after cleaning up, it is also known as golden fibre.
  • It is fibrous and tough.
  • Its individual fibre cells are hollow and narrow having thick walls containing cellulose.
  • Coconut fibres are used for making mattresses., brushes, floor mats etc.

So, the correct answer is an option (2).

         Animal fibres       Plant fibres
1) Animal fibres are extracted from animals Plant fibres are extracted from plants
2) They are made up of proteins They are made up of cellulose
3) Animal fibres have less strength as compared to plant fibres e.g. silk Plant fibres are stronger than animal fibres e.g. jute

 

  • Jute: These plants require standing water and alluvial soil to grow well.
  • Angora wool: The fur of the rabbit hair is extremely soft to touch, thus due to its desirable characteristics, they are in high demand and quite expensive.
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