NCERT Book Class 8 EVS Elixir of life water

1. Elixir of life – water

Background

Discharge of sewage into water bodies, such as rivers, lakes, and streams is hazardous to human health and also to aquatic flora and fauna. Pollution of water systems may cause outbreak of diseases like diarrhoea, dysentery, cholera, typhoid, etc. Contamination of water with certain chemicals is also a health hazard. Treatment of polluted water for human use requires large expenditure. Health problems, together with the cost of treating water, affect our economy. Project Book in Environmental Education

Methodology

1. Visit a river, canal, pond, well, or any source of water (treated or untreated) in your locality and observe and note the activities going on which may be contaminating the water body.

2. Visit a doctor or a health department official and collect information about diseases like dysentery, diarrhoea, typhoid, cholera. Also collect information about the number of people suffering from these diseases.

3. Find out if there are localities where water-borne diseases are more prevalent. If so, find out the source of water.

4. Visit a water treatment plant and find out whether the cost of treatment varies with the level of contamination/pollution. Conclusion Present the information collected by you in the form of a report.

Follow-up

Try to visit a waste water treatment plant in your vicinity. Observe how it  functions.

Please refer to attached file for NCERT Class 8 EVS Elixir of life – water