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प्रश्न
If BOD of a lake is high it means ______.
विकल्प
lake does not have decomposers
lake does not get enough light
lake is polluted
lake is not polluted
MCQ
रिक्त स्थान भरें
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उत्तर
If BOD of a lake is high it means lake is polluted.
Explanation:
High biochemical oxygen demand indicates that decomposers require much oxygen to break down organic waste, which is a sign of pollution. It does not mean decomposers are absent or that the lake is clean.
shaalaa.com
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