In Calvin cycle, carbondioxide is converted into glucose whereas in Krebs cycle, acetyl CoA is converted into into NADH.
The Calvin cycle is a process which is used by the plants and algae in order to turn carbon dioxide into sugar. Every living organisms on Earth depends on the Calvin cycle.
The Krebs cycle which is also called citric acid cycle. In this cycle, the chemical energy of acetyl CoA is converted into into nicotinamide adenine dinucleotide (NADH).
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