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PGA as the first CO₂ fixation product was discovered in the photosynthesis of

(a) a gymnosperm Your answer
(b) a bryophyte Your answer
(c) an angiosperm Your answer
(d) an alga Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

Melvin Calvin worked out the pathway using the green alga Chlorella, fed with radioactive ¹⁴CO₂. He found that the first stable product was 3-PGA.

Why the other options are wrong

(a) · your answer Calvin's experiments were done on an alga, not a gymnosperm.
(b) · your answer Bryophytes were not used in Calvin's work.
(c) · your answer The first product was found in algal cells, not an angiosperm.

NCERT point: Calvin used radioactive ¹⁴C and algal photosynthesis to show that the first CO₂ fixation product is the 3-carbon PGA.

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