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Plants in which the first product of CO₂ fixation is a 3-carbon acid are called

(a) C₂ plants Your answer
(b) C₃ plants Correct
(c) C₄ plants Your answer
(d) CAM plants Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

Plants in which the first product of CO₂ fixation is the 3-carbon acid PGA are called C₃ plants.

Why the other options are wrong

(a) · your answer "C₂" refers to the photorespiratory cycle, not a plant group.
(c) · your answer C₄ plants form a 4-carbon acid (OAA) first.
(d) · your answer CAM plants fix CO₂ first into OAA/malic acid at night.

NCERT point: Most plants, including wheat, rice and pea, are C₃.

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