Assertion :Amount of biodegradable organic matter present in water is measured by BOD of water. Reason: During biodegradation of organic compounds, oxygen is released.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Biochemical oxygen demand or BOD is the amount of oxygen required by bacteria to decompose organic matter in one litre of polluted water. So, the biodegradable organic matter present in water is measured by BOD of water. Hence, assertion is correct.
During biodegradation of organic compounds, carbon dioxide is released if degradation occurs in presence of oxygen while methane is released if degradation occurs in absence of oxygen. Hence, reason is incorrect.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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