Answer :
Final Answer:
It ensures a continuous supply of the starting molecule (RuBP) needed for carbon fixation in the Calvin cycle, allowing the cycle to operate continuously and produce glucose. Therefore, the correct answer is C).
Explanation:
The Calvin cycle, a crucial part of photosynthesis, plays a pivotal role in converting carbon dioxide into glucose, a fundamental energy source for plants. To ensure a continuous supply of glucose, the regeneration of ribulose-1,5-bisphosphate (RuBP) is essential.
RuBP is a five-carbon molecule that initiates the Calvin cycle by combining with carbon dioxide. This reaction forms a highly unstable six-carbon compound, which immediately splits into two molecules of 3-phosphoglycerate (3-PGA).
These 3-PGA molecules then undergo a series of chemical transformations to ultimately yield glucose. However, in the absence of RuBP, the cycle would come to a halt as there would be no starting material for the fixation of new carbon dioxide molecules.
Regeneration of RuBP occurs during the latter stages of the Calvin cycle, where some of the 3-PGA molecules are converted back into RuBP with the help of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).
This regeneration ensures a continuous supply of RuBP, allowing the cycle to proceed uninterrupted and maintain the production of glucose.
In summary, the correct answer is C) Regeneration of RuBP, as it is the key process that allows the Calvin cycle to sustain a continuous production of glucose, ultimately supporting plant growth and survival.
Therefore, the correct answer is C) Regeneration of RuBP ensures that the Calvin cycle can make a continuous supply of glucose.
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