Name :

(a) Factories that use water on a large scale.

(b) Effects of contaminated water.

(c) Factors connected with good social health.

(d) Diseases caused by mosquitoes.

(e) Garbage that does not decompose.

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Solution

(a) Paper industry, chemical industry and textile industry use water on a large scale.

(b) Effects of contaminated water:

• Contaminated water leads to unhygienic conditions.

• On consumption, contaminated water causes various severe diseases.

• Contaminated water also affects the organisms living in the water bodies.

(c) Following are the factors connected with good social health:

• Not allowing water to stagnate in the surrounding area

• Maintaining drinking water

• Proper disposal of garbage

• Recycling of waste

(d) Diseases caused by mosquitoes are malaria, dengue and brain fever.

(e) Non-biodegradable

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Answer in brief :

(a) Name the components of the environment.

(b) For which purposes is water used on a large scale?

(d) How does air get polluted?

(e) Explain the effects of a polluted environment.

(f) How was garbage of a village or town disposed of in the past?

Which of the following disease cannot be caused by drinking of river water contaminated with untreated sewage?

(a) cholera

(b) typhoid

(d) diarrhoea

Name three diseases caused by contaminated water.

Answer in five or six lines :

(a) What must each person do to reduce the problem of garbage disposal?

(b) What care must be taken to prevent contamination of the town or village water supply?

(d) What care should be taken in order to maintain good social health in a village or town?

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