Question

Name two natural polymers. Write four advantages of polythene over natural materials because of which it is widely used.

Answer 1

Hint: Natural polymers occur in nature and are mostly water-based. Some examples of such types of polymers are silk, cellulose, proteins and wool. These types of polymers are formed by the process of addition polymerization or condensation polymerization. Our body also has many natural polymers like nucleic acids and proteins.

Complete answer:
Polythene is a plastic that is obtained by the polymerization of a compound called ethene. It is used to make polythene bags, waterproof plastic sheets, etc. The advantages of polythene over natural materials are given below:
1) Polythene is very tough.
2) It is very durable.
3) It has light weight.
4) It is chemically unreactive.
5) It is a poor conductor of heat and electricity.
6) It can be moulded into various shapes.
7) It is very cheap.
8) It can also be rolled into sheets.

Note:
As polythene is much stronger than natural materials, it will last longer. Polythene does not decay easily, so it can be used for a longer period of time. It can also be reused. Cellulose which is a natural polymer is the main structural component of the plants.