Question
Given below are two statements:
Statement I: In $C_{3}$ plants, some $O_{2}$ binds to RuBisCO, hence ${CO}_{2}$ fixation is decreased.
Statement II: In $C_{4}$ 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:
Options
Solution
Sol. [Key Concept: Photorespiration in C₃ and C₄ plants]
Statement I is true: O₂ can compete with CO₂ at RuBisCO in C₃ plants, causing oxygenation and reducing carbon fixation. Statement II is false in the NCERT model: C₄ mesophyll cells initially fix CO₂ using PEP carboxylase, and CO₂ is concentrated around bundle sheath RuBisCO, strongly suppressing photorespiration. Thus, option (1).
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