TREE PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The enzymes involved in the Calvin cycle are unable to bind substrates in the dark.
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Sunlight is important in activating carbon fixation in the Calvin cycle.
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The Calvin cycle requires ATP and NADPH, which require sunlight to be produced.
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RuBP regeneration requires sunlight in order to occur and continue the Calvin cycle.
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Detailed explanation-1: -The Calvin cycle is considered light-independent because it can occur in darkness. However, most often the Calvin cycle takes place in sunlight. Why? The Calvin Cycle requires ATP and NADPH, which require sunlight to be produced.
Detailed explanation-2: -The Calvin cycle refers to the light-independent reactions in photosynthesis that take place in three key steps. Although the Calvin Cycle is not directly dependent on light, it is indirectly dependent on light since the necessary energy carriers ( ATP and NADPH) are products of light-dependent reactions.
Detailed explanation-3: -The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why? It is often too cold at night for these reactions to take place. Carbon dioxide concentrations decrease at night.
Detailed explanation-4: -The light-independent reactions are sometimes called the Calvin cycle because of the cyclical nature of the process. Although the light-independent reactions do not use light as a reactant (and as a result can take place at day or night), they require the products of the light-dependent reactions to function.