Respiration in Organisms — Science STD 7 — Question

Why should sports persons and athletes drink more water?

Rusting of an iron object is faster is coastal areas than in desert area. Explain why?

Can we make toys with the soil obtained from a field? Explain.

If the factory waste is acidic in nature, what could be done to save the fish in the lake?

State whether the following statements are True or False. In case a statement is false, write the correct statement.
Sewage is a solid waste which causes water pollution and soil pollution.

Name the two methods by which rusting of iron can be prevented.

It is necessary to ban the use of polythene bags and plastics. Do you agree? If yes, why?

How can you observe the three forms of water in:
At home.

How can iron articles be prevented from rusting?

Explain the term humus that is generally found in the uppermost layer of soil.