How would subjecting a CAM plant at night to normal daytime temperatures affect

ID: 3165255 • Letter: H

Question

How would subjecting a CAM plant at night to normal daytime temperatures affect its water use efficiency (CO2 captured, H2O lost)?

A. Water use efficiency would decrease due to an increasing concentration gradient for diffusion of water out of the leaf at night.

B. CO2 capture would increase, due to a temperature-induced increase in PEP carboxylase activity, which is enough to increase water use efficiency.

C. CO2 capture would decrease due to temperature inhibition of rubisco, which would decrease water use efficiency.

D. Water use efficiency would increase due to more rapid diffusion of CO2 during the day.

B. CO2 capture would increase,due to a temperature induced increase in PEP carboxylase activity which is enough to increase water use efficiency.

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