Part A When discussing photosynthesis, some people mistakenly talk about the light reactions and the dark reactions. Why is "dark reactions" an inaccurate name for the Calvin cycle? View Available Hint(s) Both the light reactions and the Calvin cycle are dependent on light. This implies that the Calvin cycle occurs only at night. The light reactions occur on the outside of a chloroplast, and the Calvin cycle occurs in the center of the chloroplast. It does not give proper credit to the scientist who discovered carbon fixation in photosynthesis. Submit Provide Feedback
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The question asks why "dark reactions" is an inaccurate name for the Calvin cycle in photosynthesis. This implies that the Calvin cycle, while not directly requiring light, is somehow linked to light or not exclusively occurring in the dark. Show more…
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Why are the reactions of the Calvin cycle sometimes referred to as the dark reactions? Do they take place only at night, or are they grim, secret reactions?
Qudsiya A.
The Calvin cycle is often referred to as the "dark reactions," but this is a poor name. Why can't the Calvin cycle proceed in the absence of light? CO2 is only available during the day. O2 is needed for carbon fixation and is a product of the light reactions. Reduction cannot happen without ATP and NADPH from the light reactions. Light is responsible for splitting water at the beginning of the Calvin cycle.
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The Calvin cycle, the "dark reactions" or carbon fixation reactions of photosynthesis, cannot occur at night in a living plant. Which of the following best describes why this is true? The stomata are incapable of opening at night, thus CO2 cannot enter the leaf. The reactions of the Calvin cycle are dependent on light reactions for high-energy compounds. Several enzymes necessary for Calvin cycle activity have been degraded during the day and must be replaced. Light is required to transport the water necessary for the cycle. Cooler temperatures at night slow enzyme activity and rates of substrate diffusion.
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