Assertion :Glycolysis is the first step of respiration in which glucose completely breaks into $C O_{2}$ 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 is the process of breakdown of glucose or similar hexose sugar into two molecules of pyruvic acid through a series of enzyme mediated reactions, releasing energy (ATP) and reducing power $(N A D H_{2})$ . It is the first step of respiration, which occurs inside the cytoplasm and is independent of $O_{2}$ . In glycolysis, two molecules of ATP are consumed during double phosphorylation of glucose to form fructose $1, 6$ diphosphate. Four molecules of ATP are produced in the conversion of $1, 3$ -diphosphoglycerate to $3$ -phosphoglycerate and phosphoenolpyruvate to pyruvate whereas, two molecules of $N A D H_{2}$ are formed during oxidation of glyceraldehyde $3$ -phosphate to $1, 3$ -diphosphoglycerate. Since, each NADH is equivalent to $3$ ATP, so net gain in glycolysis is $8$ ATP.

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Assertion :Glycolysis is the first step of respiration in which 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 in which glucose completely breaks into $C O_{2}$ and $H_{2} O$ . Reason: In this process, there is net gain of twenty four molecules of ATP.