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Why must be sewage treated?
Sewage must be treated to obtain pure and clean water. Untreated sewage contains many bacteria, viruses, fungi and parasites which cause diseases like cholera, typhoid and jaundice. Therefore to ensure that the water is free from such harmful agents, the sewage must be treated.
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?
Which problem arises by air pollution?
What is pollution?
What is air pollution?
Which gases are released by vehicles?
Which gas reduces the capacity of the blood to carry oxygen?
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Mock Test Series
