Question

summary of chapter 3science 8th class (ncert)​

Answer 1

Answer:

Synthetic fibres and plastics, like natural

fibres, are made of very large units called

polymers. Polymers are made up of many

smaller units.

While natural fibres are obtained from plants

and animals, synthetic fibres are obtained by

chemical processing of petrochemicals. Like

natural fibres, these fibres can also be woven

into fabrics.

Synthetic fibres find uses ranging from many

household articles like ropes, buckets,

furniture, containers, etc. to highly specialized

uses in aircrafts, ships, spacecrafts,

healthcare, etc.

Depending upon the types of chemicals used

for manufacturing synthetic fibres, they are

named as Rayon, Nylon, Polyester and Acrylic.

The different types of fibres differ from one

another in their strength, water absorbing

capacity, nature of burning, cost, durability,

etc.

Today, life without plastics cannot be imagined.

Be it home, or outside, plastic is every where.

The waste created by plastics is not

environment friendly. On burning plastics

release poisonous gases. On dumping in the

ground they may take years to degenerate.

This is because of their non-biodegradable

nature.

We need to use synthetic fibres and plastics

in such a manner that we can enjoy their good

qualities and at the same time minimise the

environmental hazards for the living

communities.

Explanation:

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