Question

why is Calvin cycle also called C3 pathway​

Answer 1

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Plants use energy from the sun in tiny energy factories called chloroplasts. ... Those plants that utilize just the Calvin cycle for carbon fixation are known as C3 plants. Carbon dioxide diffuses into the stroma of chloroplasts and combines with a five-carbon sugar, ribulose1,5-biphosphate (RuBP).

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Answer 2

Because
1. It was discovered by melvin calvin
2. The 1st stable product formed in this cycle is 3 carbon compound PGA(3c)