Assertion :Glycolysis is the first step of respiration, where glucose completely breaks into CO $_{2}$ and H $_{2}$ O. Reason: In this process, there is net gain of twenty four molecules of ATP.

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 D Both Assertion and Reason are incorrect.
Glycolysis forms the first step of respiration which does not require oxygen. In this process partial breakdown of glucose takes place to produce two molecules of pyruvic acid in cytoplasm. In this process there is net gain of two molecules of ATP.

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Assertion :Glycolysis is the first step of respiration, where glucose completely breaks into CO2 and H2O. Reason: In this process, there is net gain of twenty four molecules of ATP.

Assertion :Glycolysis is the first step of respiration, where glucose completely breaks into CO $_{2}$ and H $_{2}$ O. Reason: In this process, there is net gain of twenty four molecules of ATP.