Both C₃ and C₄ plants Have the Enzymes of the Calvin

question 14

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) 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.
• B) In C₄ plants, carbon fixation takes place in mesophyll cells, whereas the Calvin cycle takes place in bundle- sheath cells.
• C) 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.
• D) C₄ plants do not have rubisco and therefore do not undergo photorespiration.

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