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Q.
Which one of the following gases contributes maximum to the 'green house effect' on the earth?
AIPMTAIPMT 1994Environmental Issues
Solution:
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.