In photosynthesis, the dark reaction is called so because:
Correct answer: B. It does not require light energy.
- A. It occurs in darkness.
- B. It does not require light energy.
- C. It cannot occur during the daytime.
- D. It occurs more rapidly at night.
Explanation
The dark reactions of photosynthesis are also known as the Calvin cycle, and they are called "dark reactions" not because they occur in the dark, but because they do not directly require light. Unlike the light-dependent reactions that take place in the thylakoid membranes and require light energy to generate ATP and NADPH, the Calvin cycle occurs in the stroma of chloroplasts and can proceed in the absence of light.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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