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Question
In which of the following plants, PEP (phosphoenolpyruvate) is the primary CO2 acceptor?
In which of the following plants, PEP (phosphoenolpyruvate) is the primary CO2 acceptor?
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Solution
The correct option is B C4 plants
Phosphoenolpyruvate (3 carbon compound) is the primary CO2 acceptor in C4 plants. It undergoes carboxylation to form oxaloacetic acid (4 carbon compound). RuBP is the primary CO2 acceptor in C3 plants. C4 plants have evolved to use a different means of carbon fixation in order to minimize losses from a process called photorespiration, also called the C2 cycle. There are no plants in which only the C2 cycle takes place. The C2 cycle coexists with the C3 cycle in C3 plants.
Phosphoenolpyruvate (3 carbon compound) is the primary CO2 acceptor in C4 plants. It undergoes carboxylation to form oxaloacetic acid (4 carbon compound). RuBP is the primary CO2 acceptor in C3 plants. C4 plants have evolved to use a different means of carbon fixation in order to minimize losses from a process called photorespiration, also called the C2 cycle. There are no plants in which only the C2 cycle takes place. The C2 cycle coexists with the C3 cycle in C3 plants.
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