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Even though the first product of C4 plants is a 4-carbon acid, the main biosynthetic pathway in them is the

  • (a) pentose phosphate pathway of respiration Your answer
  • (b) C4 pathway only Your answer
  • (c) C3 pathway (Calvin cycle) Correct
  • (d) glycolate pathway Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Although the first product is a 4-carbon acid, the main biosynthetic pathway in C4 plants is still the C3 pathway (Calvin cycle), which runs in the bundle sheath.

Why the other options are wrong

  • (a) · your answer The pentose phosphate pathway is part of respiration.
  • (b) · your answer The C4 steps only carry CO2; sugar is made by the Calvin cycle.
  • (d) · your answer The glycolate pathway is photorespiration.
NCERT point: NCERT: the Calvin pathway is common to all photosynthetic plants.
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