MHT CET · BIOLOGY · STD 11 - 13. Respiration and Energy Transfer

How many molecules of \(NADPH _2\) will be required for synthesis of 10 glucose molecules

A 120
B 100
C 200
D 180

Verified Solution

Answer & Solution

Correct Answer

(A) 120

Step-by-step Solution

Detailed explanation

The synthesis of glucose from carbon dioxide during photosynthesis requires 18 molecules of ATP and 12 molecules of NADPH2. Each molecule of glucose contains 6 carbon atoms, so the synthesis of 10 glucose molecules requires a total of 60 carbon atoms. Therefore, the total number of \(NADPH _2\) molecules required would be: 12 molecules \(NADPH _2\) per glucose x 10 glucose molecules \(=120\) molecules \(NADPH _2\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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