Crop Production and Management — Science STD 8 — Question

Food should always be covered.

Global warming is a serious global threat.

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?

Plant cell is rigid while animal cell comparatively soft.

Water should be boiled and then used during an epidemic.

The stars are not visible in the daytime.

Two persons cannot communicate with each other on the moon.

Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.

Use of chemical fertilisers should be reduced.