PHOTOSYNTHESIS
THE CALVIN CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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it only happens during the dark
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it can happen on daytime or night time
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it only happens during daytime
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Detailed explanation-1: -Though it is called the “dark reaction", the Calvin cycle does not actually occur in the dark or during night time. This is because the process requires NADPH, which is short-lived and comes from the light-dependent reactions.
Detailed explanation-2: -Calvin Cycle : Example Question #3 Which of the following is not true of the Calvin cycle? Explanation: Despite the Calvin cycle’s other name (light independent reactions), light is indirectly required for this process to function. All other choices are true of the Calvin cycle.
Detailed explanation-3: -Electron transfer helps generate NADPH and ATP, which are used in the Calvin cycle. Therefore, the Calvin cycle is more likely to happen during daylight after the light-dependent stage has sufficiently produced NADPH and ATP.
Detailed explanation-4: -The plants shut down the Calvin Cycle in the dark when the levels of ATP and NADPH decline because the Calvin Cycle needs reduced NADP, which is short-lived and occurs from light-dependent reactions.
Detailed explanation-5: -The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night.