The reactions of photosynthesis consist of:
Correct answer: A. Two phases
- A. Two phases
- B. Four phases
- C. Three phases
- D. Many phases
Explanation
The correct answer is Option A. Photosynthesis comprises two main phases: the light-dependent reactions and the Calvin cycle. During the light-dependent reactions, which take place in the thylakoid membranes, light energy is used to produce ATP and NADPH while splitting water molecules into oxygen and hydrogen ions. The Calvin cycle occurs in the stroma of chloroplasts and utilizes ATP and NADPH to fix carbon dioxide into glucose. Options B, C, and D are incorrect, as they suggest incorrect numbers of phases, deviating from the established two-phase process of photosynthesis.
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