NEET-UG Biology · Class 11
C4 pathway and Kranz anatomy — NEET & JEE Questions
C4 pathway and Kranz anatomy is a topic in Photosynthesis in Higher Plants, a Class 11 Biology chapter of the NEET-UG syllabus. TestBudy holds 12 published NEET-UG questions on C4 pathway and Kranz anatomy, each with the marking scheme of the real paper.
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C4 pathway and Kranz anatomy MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
What is the primary carbon dioxide acceptor in the mesophyll cells of C4 plants?
- A. RuBP
- B. PGA
- C. PEP
- D. Malate
Why does PEP carboxylase favour carbon fixation in C4 mesophyll cells under warm conditions?
- A. It functions only when stomata are fully open
- B. It releases oxygen while fixing carbon dioxide
- C. It directly synthesises glucose
- D. High CO2 affinity and no oxygenase activity
What does Kranz anatomy refer to in a typical C4 leaf?
- A. Bundle-sheath rings around vascular bundles
- B. The absence of chloroplasts from mesophyll cells
- C. A single epidermal layer without stomata
- D. Parallel venation alone
In C4 plants, the initial fixation of carbon dioxide in mesophyll cells is catalysed mainly by
- A. PEP carboxylase
- B. RuBisCO only
- C. ATP synthase
- D. nitrate reductase
In a C4 plant, a four-carbon acid formed in the mesophyll is transported to bundle-sheath cells and decarboxylated. What is the main advantage of this step?
- A. It supplies oxygen directly to RuBisCO
- B. Raises CO2 around RuBisCO
- C. It replaces the Calvin cycle
- D. It eliminates the need for ATP
The first stable product of the initial C4 fixation step is typically a four-carbon compound such as
- A. oxaloacetate
- B. 3-phosphoglycerate only
- C. ribulose bisphosphate
- D. glucose
Why is carbon dioxide concentrated in bundle-sheath cells of C4 plants?
- A. To favour RuBisCO carboxylation and suppress photorespiration
- B. To stop the Calvin cycle
- C. To increase oxygen binding by RuBisCO
- D. To prevent any ATP formation
Which tissue arrangement is characteristic of Kranz anatomy?
- A. Bundle-sheath cells arranged prominently around vascular bundles with mesophyll outside them
- B. Only epidermal cells surrounding stomata
- C. No bundle-sheath cells
- D. Vascular tissue absent from leaves
Plant X fixes carbon dioxide first with PEP carboxylase in mesophyll cells and runs the Calvin cycle mainly in bundle-sheath cells. Plant Y performs primary fixation and the Calvin cycle in mesophyll chloroplasts. Which interpretation is correct?
- A. Both are C4 plants
- B. X is a C3 plant and Y is a C4 plant
- C. X is C4; Y is C3
- D. Both are C3 plants
Compared with a C3 plant under hot, bright conditions, a C4 plant often maintains higher photosynthetic efficiency because it
- A. reduces photorespiration by concentrating CO2 near RuBisCO
- B. uses no ATP in carbon fixation
- C. lacks the Calvin cycle
- D. never opens stomata
Common mistakes in C4 pathway and Kranz anatomy
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Assuming the C4 pathway and the Calvin cycle use the same carbon dioxide acceptor.
- Assumes C4 acids are unrelated to spatial CO2 concentration.
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