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The first stable product of CO2 fixation found by Calvin was a

  • (a) 3-carbon acid, 3-phosphoglyceric acid Correct
  • (b) 6-carbon sugar, glucose Your answer
  • (c) 4-carbon acid, oxaloacetic acid Your answer
  • (d) 2-carbon compound, glycolic acid Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

Calvin found that the first stable product of CO2 fixation was the 3-carbon acid 3-phosphoglyceric acid (PGA).

Why the other options are wrong

  • (b) · your answer Glucose is formed much later.
  • (c) · your answer OAA (4C) is the first product in C4 plants, discovered later.
  • (d) · your answer Glycolic acid is part of photorespiration.
NCERT point: This is why the Calvin pathway is called the C3 pathway.
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