Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 9 PCB MCQ (Single Correct)

Which of the following enzymes are involved in the initial and second carbon fixation in sorghum, and in which cells do they occur, respectively?

A
Phosphoenolpyruvate carboxylase in bundle sheath cells; RuBisCO in mesophyll cells
B
Phosphoenolpyruvate carboxylase in mesophyll cells; RuBisCO in bundle sheath cells'
C
Phosphoenolpyruvate carboxylase in both mesophyll cells and bundle sheath cells
D
RuBisCO in both mesophyll cells and bundle sheath cells

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Text Solution

Verified by Experts
The correct answer is:
B

Sorghum is a plant. The initial fixation occurs in mesophyll cells by phosphoenolpyruvate
(PEP) carboxylase, forming oxaloacetate ( → malate/aspartate). These acids move to the bundle sheath cells, where they are decarboxylated; the released is then fixed a second time by RuBisCO via the Calvin cycle.

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