Question : It is necessary that Calvin cycle runs for six times.

1.	Question : It is necessary that Calvin cycle runs for six times.
Answer» Solution :ATP and NADPH produced at the end of light reaction are used in BIOSYNTHETIC phase. `CO_(2)` COMBINES with molecule RuBP and forms PGA. If this cycle runs for SIX times, 6 molecules of RuBP combine with `6CO_(2)`, form 12 molecules of PGAL in reduction out of that two molecules of PGAL are used for making a molecule of glucose and remaining 10 molecules of PGAL form 6 RuBP again by regeneration. THUS cycle continues, during that `CO_(2)` is obtained from atmosphere and glucose is formed at the end.

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