Which statement about photosynthesis in C4 plants is NOT true?

A.	the first product of carbon dioxide fixation is a compound with 4 carbon atoms.
B.	C4 photosynthesis is an adaptation for plants living in hot, arid climates.
C.	carbon dioxide is initially fixed in mesophyll cells, but the Calvin cycle is active in bundle sheath cells in leaves of C4 plants.
D.	less ATP is used overall for sugar biosynthesis in C4 than in C3 plants C4 photosynthesis is an adaptation for plants living in hot, arid climates like Tucson, Arizona. C4 plants initially fix CO2 in mesophyll cells as 4-carbon compounds, and later release CO2 in bundle sheath cells. There is an additional ATP requirement for each carbon dioxide utilized in this pathway.
E.	photorespiration is minimal in C4 plants compared to C3 plants.

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Monday, September 30, 1996
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