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Question
The C4 plants are photosynthetically more efficient than C3 plants because
The C4 plants are photosynthetically more efficient than C3 plants because
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Solution
The correct option is D CO2 generated during photorespiration is trapped and recycled through PEP carboxylase.
In C3 plants, when the level of carbon dioxide falls below about 50 ppm, the catalyst RuBisCO that helps to fix carbon begins to fix oxygen. C4 plants have the enzyme phosphoenolpyruvate carboxylase. This enzyme catalyzes the conversion of 3 carbon phosphoenolpyruvate (PEP) to oxaloacetete which is quickly converted to malate. This malate is actively pumped across the cell membrane into the bundle sheath cell and is split into carbon dioxide and a 3-carbon compound. This carbon dioxide then enters the Calvin cycle. Thus the correct answer is option D.
In C3 plants, when the level of carbon dioxide falls below about 50 ppm, the catalyst RuBisCO that helps to fix carbon begins to fix oxygen. C4 plants have the enzyme phosphoenolpyruvate carboxylase. This enzyme catalyzes the conversion of 3 carbon phosphoenolpyruvate (PEP) to oxaloacetete which is quickly converted to malate. This malate is actively pumped across the cell membrane into the bundle sheath cell and is split into carbon dioxide and a 3-carbon compound. This carbon dioxide then enters the Calvin cycle. Thus the correct answer is option D.
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