Compared with a C 3 plant, a C 4 plant:

C4 plants require more ATP to fix CO2 because they use an additional set of reactions to concentrate CO2 in the bundle-sheath cells, which involves the conversion of pyruvate to phosphoenolpyruvate (PEP) and the regeneration of PEP, both of which require ATP.

Compared with a C 3 plant, a C 4 plant:

C4 plants require more ATP to fix CO2 because they use an additional set of reactions to concentrate CO2 in the bundle-sheath cells, which involves the conversion of pyruvate to phosphoenolpyruvate (PEP) and the regeneration of PEP, both of which require ATP.

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Compared with a C₃ Plant, a C₄ Plant

Question 35

Multiple Choice

Compared with a C₃ plant, a C₄ plant:

A) carries out more photorespiration.
B) has a lower photosynthetic efficiency.
C) has more Rubisco.
D) has a higher leaf nitrogen content.
E) needs more ATP to fix CO₂.

Correct Answer: