Question:
Which one of the following gases contributes maximum to the 'green house effect' on the earth?
Which one of the following gases contributes maximum to the 'green house effect' on the earth?
Updated On: Jul 12, 2022
- carbon dioxide
- chlorofluoro carbon
- freon
- methane.
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The Correct Option is A
Solution and Explanation
When sewage mixes with water body, micro- organisms present in it biodegrade organic matter of sewage using oxygen. This results into a sharp decline in dissolved oxygen which may cause mortality of aquatic creatures. Gradually, however, dissolved oxygen increases in concentration with the completion of biodegradation of sewage matter.
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