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Question

Fixation and reduction of CO2 require

A
ATP
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B
NADPH, chlorophyll, water
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C
ATP, NADPH
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D
ATP, NADPH and light
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Solution

The correct option is C ATP, NADPH
A) In addition to ATP, reduction and fixation of CO2 required NADPH.
B) Chlorophyll and water are involved in the light reaction and NADPH are produced. They are not involved in the fixation and reduction of CO2
C) Both ATP and NADPH (which are synthesised during the dark reaction are required to fix and reduce CO2 in the dark reaction.
D) Light is not required in the fixation and reduction of CO2. It takes place both in the presence and absence of light.
So the correct answer is 'ATP, NADPH'.

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