Assertion :Cytochrome oxidase enzyme contains copper. Reason: Cyanide combines with the copper of cytochrome oxidase and prevents $O_{2}$ combining with it.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
The final stage of respiratory chain involves cytochrome oxidase, which contain copper. This stage can be specifically inhibited by cyanide or carbon monoxide cyanide combines with copper and prevents $O_{2}$ from combining with it.

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