Photorespiration is present in C3 plants but absent in C4 plants. C4 plants minimize photorespiration by separating initial CO2 fixation and the Calvin cycle by performing these steps in different cell types. This phenomenon occurs due to the RuBisCO enzyme's dual nature, which works on oxygenase activity if there is less carbon dioxide or more oxygen concentration.
The process which makes a major difference between C_3 and C_4 plants is:
NEET UG 2016 — Botany Photosynthesis in Higher Plants
2016mcqeasy
The process which makes a major difference between C3 and C4 plants is:
Official previous-year question
Held on 30 Apr 2016 · Verified 9 Jul 2026.
Options
- A
Glycolysis
- B
Calvin cycle
- C
Photorespiration
- D
Respiration
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Which of the following statements about RuBisCO is true?
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How many molecules of ATP and NADPH are required for every molecule of $\mathrm{CO}_2$ fixed in the Calvin cycle?
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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:
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