Answer :
Final Answer:
The reaction that ensures the Calvin cycle can make a continuous supply of glucose is (d). Regeneration of RuBP.
Explanation:
In the Calvin cycle, a series of chemical reactions occur to convert carbon dioxide into glucose, a crucial process in photosynthesis. The Calvin cycle can be broken down into three main stages: carbon fixation, reduction, and regeneration of ribulose-1,5-bisphosphate (RuBP).
Carbon Fixation: During this stage, carbon dioxide is captured and converted into a three-carbon compound, 3-phosphoglycerate (3-PGA). This step is essential as it initiates the incorporation of carbon from the atmosphere into organic molecules.
Production of G3P: In the subsequent reduction stage, 3-PGA is reduced to form glyceraldehyde-3-phosphate (G3P), a three-carbon sugar. G3P can be used to synthesize glucose, but it's not the final product of the cycle.
Regeneration of RuBP: The key to sustaining the Calvin cycle lies in the regeneration of RuBP. RuBP is a five-carbon molecule that is essential for the initial step of carbon fixation. Without the continuous regeneration of RuBP, the cycle would stall, and glucose production would cease.
Therefore, while all the mentioned reactions are important in the Calvin cycle, it is the regeneration of RuBP (option d) that ensures a continuous supply of glucose and the continued operation of the cycle.
The Calvin cycle is a complex process involving multiple enzymes and intermediate compounds. Understanding its intricacies can shed light on the efficiency of photosynthesis and how plants produce their energy and biomass.
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