NCERT Class VI Science Solution: Chapter 3-Fibre to Fabric Part 1

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Question 1:

Classify the following fibres as natural or synthetic:

Nylon, wool, cotton, silk, polyester, jute

Answer:

Fibre is a natural or synthetic substance that is significantly longer than it is wide. Fibre is a piece of material that is long, thin and flexible, like a length of thread. Plant fibres are the basis of fabric such as cotton. Silk and wool fibres come from animals.

Diagram shows two types of fibres

Types of Fibres

Diagram shows two types of fibres

Natural Fibres:

Natural fibers or natural fibres are fibres that are produced by plants, animals, and geological processes. They can be used as a component of composite materials, where the orientation of fibers impacts the properties. Natural fibers can also be matted into sheets to make products such as paper, felt or fabric. Natural fibers can be used for high-tech applications, such as composite parts for automobiles. Compared to composites reinforced with glass fibers, composites with natural fibers have advantages such as lower density, better thermal insulation, and reduced skin irritation. Further, unlike glass fibers, natural fibers can be broken down by bacteria once they are no longer in use

Example: wool, cotton, silk, jute

Image result for Examples of Natural Fibres

Natural Fibres

Image result for Examples of Natural Fibres

Synthetic Fibres:

Synthetic fibers are fibers made by humans with chemical synthesis, as opposed to natural fibers that humans get from living organisms with little or no chemical changes. They are the result of extensive research by scientists to improve on naturally occurring animal fibers and plant fibers. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets into air and water, forming a thread. These fibers are called synthetic or artificial fibers. Some fibers are manufactured from plant-derived cellulose and are thus semisynthetic, whereas others are totally synthetic, being made from crudes and intermediates including petroleum, coal, limestone, air, and water. In the textile industries, cellulose fibers are usually differentiated from synthetic fibers in the sense of fully synthetic ones.

Example: nylon, polyester

Image result for Synthetic Fibres

Synthetic Fibres

Image result for Synthetic Fibres

Question 2:

State whether the following statements are true or false:

  1. Yarn is made from fibres.

  2. Spinning is a process of making fibres.

  3. Jute is the outer covering of coconut.

  4. The process of removing seed from cotton is called ginning.

  5. Weaving of yarn makes a piece of fabric.

  6. Silk fibre is obtained from the stem of a plant.

  7. Polyester is a natural fibre.

Answer:

  1. Yarn is made from fibres. (True)

  2. Spinning is a process of making fibres. (False)

  3. Jute is the outer covering of coconut. (False)

  4. The process of removing seed from cotton is called ginning. (True)

  5. Weaving of yarn makes a piece of fabric. (True)

  6. Silk fibre is obtained from the stem of a plant. (False)

  7. Polyester is a natural fibre. (False)