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Question

The following question consist of two statements, assertion and reason. While answering the question, you are required to choose any one of the following five responses.

Assertion: Each molecule of ribulose-1,5-bisphosphate fixes one molecule of CO2.

Reason: Three molecules of NADPH and two ATP are required for fixation of one molecule of CO2.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.
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B
If assertion is true but the reason is false.
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C
If both assertion and reason are true but the reason is not the correct explanation of the assertion.
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D
If both assertion and reason are false.
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E
If assertion is false but the reason is true.
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Solution

The correct option is B If assertion is true but the reason is false.
Assertion-Reason relation

In C3 plants, fixation of carbon dioxide involves a molecule of ribulose-1,5-bisphosphate. It combines with CO2 with the help of enzyme RuBP carboxylase. This forms two molecules of 3-phosphoglycerate (3C).

Hence, the given assertion statement- “Each molecule of ribulose-1,5-bisphosphate fixes one molecule of CO2” is true.

Assertion-Reason relation

Calvin cycle, also known as dark reaction uses energy molecules like ATP and NADPH to produce glucose by carbon dioxide fixation.

In order to fix a single molecule of carbon dioxide, three molecules of ATP and two molecules of NADPH are required.

Hence, the given reason statement- “Three molecules of NADPH and two ATP are required for fixation of one molecule of CO2” is false.

Final answer

(C) If assertion is true but the reason is false.

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