Answer :
Final answer:
The last stage of the Calvin cycle recycles G3P to aid in the regeneration of RuBP, essential for the continuous operation of the Calvin cycle and photosynthesis. The correct answer is d) G3P, regeneration of RuBP.
Explanation:
The last stage of the Calvin cycle acts to recycle G3P, sending it back to aid in regeneration of RuBP again. The Calvin cycle operates through three stages: carbon fixation, reduction, and regeneration. In the regeneration stage, five out of six molecules of G3P produced in the cycle are used to regenerate RuBP. This enables the Calvin cycle to prepare for more COâ‚‚ to be fixed, utilizing three more molecules of ATP in the process. This step ensures the continuous operation of the Calvin cycle, which is essential for photosynthesis and thus the survival and growth of plants.