Stars and the Solar System — Science STD 8 — Question

Microorganisms are considered as friends and enemies of human being.

Do not include chips, packed food and junk food as a part of regular meal during adolescence.

Two persons are applying forces on two opposite sides of a moving cart. The cart still moves with the same speed in the same direction. What do you infer about the magnitudes and direction of the forces applied?

When a paper cup filled with water is heated upon the flame of a candle the paper cup does not burn.

The tools used for cutting and piercing always have sharp edges.

charged glass rod attract a charged plastic straw.

One day Seema’s uncle visited her place. Seema prepared dinner for him. When she was about to put rock salt on the salad, her uncle interrupted her and asked to put iodised salt instead of rock salt. He also advised her to prefer iodised salt instead of rock salt. Why do you think Seema’s uncle advised her to have iodised salt instead of rock salt?

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?

Why oil is added while making pickle?

Earthworms are called friends of farmers.