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The Calvin cycle was worked out by Melvin Calvin and co-workers using

(a) radioactive ¹⁴C Correct
(b) ¹⁵N Your answer
(c) ³²P Your answer
(d) ¹⁸O Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

Calvin and co-workers traced the path of carbon in photosynthesis using radioactive ¹⁴C.

Why the other options are wrong

(b) · your answer ¹⁵N is used for nitrogen studies.
(c) · your answer ³²P is used for phosphorus studies.
(d) · your answer ¹⁸O was used to show that O₂ comes from water.

NCERT point: Calvin used radioactive ¹⁴C in algal photosynthesis and found that the first product of CO₂ fixation was 3-PGA.

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