The assimilatory and reducing powers synthesized in the light reaction of photosynthesis are utilized in:
Correct answer: C. Reduction phase of Calvin cycle
- A. Fixation phase of Calvin cycle
- B. Regeneration phase of Calvin cycle
- C. Reduction phase of Calvin cycle
- D. Condensation phase of Calvin cycle
Explanation
The Calvin cycle consists of three main phases: fixation, reduction, and regeneration. The reduction phase is where the assimilatory and reducing powers, ATP and NADPH, are utilized. In this phase, 3-phosphoglycerate is converted into glyceraldehyde-3-phosphate (G3P) using ATP and NADPH from the light reactions. This phase involves the reduction of 3-phosphoglycerate and incorporation of energy and electrons, which is why ATP and NADPH are crucial. The fixation phase focuses on CO₂ incorporation and does not directly use ATP or NADPH, while the regeneration phase uses ATP but not NADPH. The 'condensation phase' does not exist in the Calvin cycle.
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