Microorganisms: Friend and Foe — Science STD 8 — Question

The handle of cricket bat is usually rough.

A charged balloon is attracted by another charged balloon.

Many people in world find it status symbol of wearing and keeping leather clothes and leather articles with them. Even Shahtoosh shawls made of an endangered species of antelope are also in greater demand and highly priced.

Do you think we must use leather items for just show off?

What is endangered species?

Can you name an extinct species which was exploited for its meat?

What values of people are shown in above paragraph?

Recycling of paper should be done.

Earthworms are called friends of farmers.

A bicycle and motor mechanics uses grease between the moving parts of these machines.

Electroplating factories dispose their conducting solution and polluting waste far away from residential area.

Microorganisms are considered as friends and enemies of human being.

Iron girders used in the bridges are coated with zinc.

Brake pads are used in the brake system of the bicycle and automobiles.