C3 plants are more susceptible to photorespiration than either C4 or CAM plants. Why do most plants lack the C4
pathway?
a. Rubisco is more efficient in C3 plants when compared to rubisco of C4 and CAM plants.
b. Photorespiration is not a serious problem for most plants.
c. Most plant species do not have vacuoles in their cells to store the malate generated from CO2 taken in during
the night.
d. There is an energetic cost to C4 and CAM pathways that only makes them advantageous in very hot and/or
arid environments.
e. Switching between C3, C4, and CAM photosynthesis is very difficult for most plants.
ANSWER: d
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