Both C₃ and C₄ Plants Have the Enzymes of the Calvin

question 25

Multiple Choice

Both C₃ and C₄ plants have the enzymes of the Calvin cycle.How are C₄ plants more efficient than C₃ plants at fixing carbon?

• A)In C₄ plants,carbon fixation takes place in mesophyll cells,whereas the Calvin cycle takes place in bundle-sheath cells.
• B)Both the carbon fixation reaction and the Calvin cycle take place in mesophyll cells,but the carbon fixation reactions take place in the dark,and the Calvin cycle is light dependent.
• C)C₄ plants do not have rubisco and therefore do not undergo photorespiration.
• D)C₄ plants fix carbon using the Calvin cycle;C₃ plants use the reverse of glycolysis,a series of reactions that requires more energy in the form of ATP.

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