PHOTOSYNTHESIS
THE CALVIN CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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3
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6
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1
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12
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Detailed explanation-1: -The Calvin cycle is a light-independent reaction in photosynthesis and takes place in three steps, viz., carbon fixation, reduction and regeneration. For the fixation of six molecules of CO2, six turns of the cycle are required. Six turns of the Calvin cycle results in the synthesis of one molecule of glucose.
Detailed explanation-2: -It would take six turns of the cycle, or 6 CO2start text, C, O, end text, start subscript, 2, end subscript, 18 ATP, and 12 NADPH, to produce one molecule of glucose.
Detailed explanation-3: -A molecule of glucose is made up of six carbon molecules. Therefore, six turns will be required for the synthesis of one molecule of glucose by Calvin cycle.
Detailed explanation-4: -The Calvin cycle actually produces a three-carbon sugar glyceraldehyde 3-phosphate (G3P). For the Calvin cycle to synthesize one molecule of sugar (G3P), three molecules of CO2 Must enter the cycle.
Detailed explanation-5: -Because the carbohydrate molecule has six carbon atoms, it takes six turns of the Calvin cycle to make one carbohydrate molecule (one for each carbon dioxide molecule fixed). The remaining G3P molecules regenerate RuBP, which enables the system to prepare for the carbon-fixation step.