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Correctly match the photosynthetic pathways (Group I) with their first stable products (Group II) in respective plants (Group III)

Group IGroup IIGroup III
(P) C3 cycle(1) 3-Phosphoglycerate(a) Wheat
(Q) C4 cycle(2) Glyceraldehyde-3-phosphate(b) Sugarcane
(R) CAM(3) Oxaloacetate(c) Pineapple

  • A.P-1-a; Q-3-b; R-3-c
  • B.P-1-a; Q-2-b; R-3-c
  • C.P-1-b; Q-3-a; R-2-c
  • D.P-1-b; Q-2-c; R-2-a

Answer: A

The correct match is P-1-a; Q-3-b; R-3-c.

  • C3 cycle: Rubisco fixes CO2 onto ribulose-1,5-bisphosphate, and the first stable product is the three-carbon 3-phosphoglycerate. Wheat is a C3 plant.
  • C4 cycle: PEP carboxylase fixes CO2 onto phosphoenolpyruvate, giving the four-carbon oxaloacetate. Sugarcane is a C4 plant.
  • CAM: the same PEP carboxylase reaction, run at night, also gives oxaloacetate, which is stored as malic acid. Pineapple is a CAM plant.

Glyceraldehyde-3-phosphate is formed later in the Calvin cycle by reduction of 3-phosphoglycerate, so it is no pathway's first stable product. Options assigning wheat to C4, sugarcane to C3 or pineapple to anything but CAM are wrong as well.

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