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Mention the characteristics of drinking (potable) water.
The characteristics of potable water are :
(i) It should be colourless and odourless.
(ii) It should be free from any suspended impurities.
(iii) It should be free from any harmful germs.
(iv) It should be free from large quantity of salts.
(v) It should be free from any harmful salt such as nitrates, cyanides, urea etc.
Clear, transparent water is always fit for drinking. Comment.
You are a member of the municipal body of your town.
Make a list of measures that would help your town to ensure the supply of clean water to all its residents.
Explain the differences between pure air and polluted air.
Explain circumstances leading to acid rain. How does acid rain affect us?
Which of the following is not a greenhouse gas?
Describe the ‘Green House Effect’ in your own words.
Prepare a brief speech on global warming. You have to deliver the speech in your class.
Describe the threat to the beauty of the Taj Mahal.
Why does the increased level of nutrients in the water affect the survival of aquatic organisms?
What are the main causes of smoke?
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