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RuBisCO and photorespiration in C4 plants
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Given below are two statements: Statement I: RuBisCO is the most abundant enzyme in the world. Statement II: Photorespiration does not occur in C4 plants. In the light of the above statements, choose the most appropriate answer from the options given below:A Statement I is correct but Statement II is incorrectB Statement I is incorrect but Statement II is correctC Both Statement I and Statement II are correctD Both Statement I and Statement II are incorrectRuBisCO (ribulose bisphosphate carboxylase-oxygenase) is indeed considered the most abundant enzyme in the world, so Statement I is correct. In C4 plants, RuBisCO is localised in the bundle sheath cells where $CO_2$ concentration is kept high, effectively suppressing its oxygenase activity, so photorespiration does not occur (or is negligible) in C4 plants — Statement II is also correct.