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Study the pathway given below.
In which option are the correct words for all three blanks A, B and C given?

  • (a) A - Decarboxylation, B - Reduction, C - Regeneration Your answer
  • (b) A - Fixation, B - Transamination, C - Regeneration Your answer
  • (c) A - Fixation, B - Decarboxylation, C - Regeneration Correct
  • (d) A - Carboxylation, B - Decarboxylation, C - Reduction Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

The figure shows the C4 pathway. A is fixation of CO2 by PEP in the mesophyll, B is decarboxylation (the C4 acid releases CO2) in the bundle sheath, and C is regeneration of PEP from pyruvate.

Why the other options are wrong

  • (a) · your answer The pathway starts with fixation of CO2; reduction is not a named step of the C4 cycle.
  • (b) · your answer There is no transamination in the C4 cycle; B is decarboxylation.
  • (d) · your answer C is regeneration of PEP, not reduction.
NCERT point: C4 pathway: fixation (mesophyll) → decarboxylation (bundle sheath) → regeneration of PEP.
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