The C4 pathway is certainly more efficient than the C3 pathway in the sense of carbon fixation. In C3 plants, carbon dioxide and oxygen are both present. This means that most of the ribulose-1,5-bisphosphate is carboxylated, but some of the ribulose-1,5-bisphosphate is oxygenated. This results in photorespiration. So the correct option is Lower rate of photorespiration.
C_4-plants are more efficient in photosynthesis than C_3-plants due to
NEET UG 2010 — Botany Photosynthesis in Higher Plants
2010mcqmedium
C4-plants are more efficient in photosynthesis than C3-plants due to
Official previous-year question
Held on 30 Apr 2010 · Verified 9 Jul 2026.
Options
- A
higher leaf area
- B
presence of larger number of chloroplasts in the leaf cells
- C
presence of thin cuticle
- D
lower rate of photorespiration
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More NEET UG Photosynthesis in Higher Plants questions
Match List I with List II: $\begin{array}{|l|l|l|l|}\hline & \text{List - I} & & \text{List - II} \\\hline \text{A}. & \text{Chlorophyll a} & \text{(i)} & \text{Yellow-green} \\\hline \text{B.} & \text{Chlorophyll b} & \text{(ii)} & \text{Yellow} \\\hline \text{C.} & \text{Xanthophylls} & \text{(iii)} & \text{Blue-green} \\\hline \text{D.} & \text{Carotenoids} & \text{(iv)} & \text{Yellow to Yellow-orange} \\\hline\end{array}$ Choose the option with all correct matches.
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Which of the following statements about RuBisCO is true?
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Observe the given figure. Identify the different stages labelled with alphabets by selecting the correct option. 
2024medium
How many molecules of ATP and NADPH are required for every molecule of $\mathrm{CO}_2$ fixed in the Calvin cycle?
2024medium
Given below are two statements: Statement I: In $\mathrm{C}_3$ plants, some $\mathrm{O}_2$ binds to RuBisCO, hence $\mathrm{CO}_2$ fixation is decreased. Statement II: In $\mathrm{C}_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration. In the light of the above statements, choose the correct answer from the options given below:
2024medium
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