All GRE Subject Test: Biology Resources
Example Questions
Example Question #11 : Understanding Photosynthesis
CAM (crassulacean acid metabolism) plants undergo __________ photosynthesis and keep their stomata __________ during the day.
Possible Answers:
C3 . . . open
C4 . . . open
C4 . . . closed
C3 . . . closed
reverse . . . closed
Correct answer:
C4 . . . closed
Explanation:
CAM plants utilize C4 photosynthesis and keep their stomata closed during the day. By using the enzyme PEP carboxylase, CAM plants are able to store up enough fixed carbon during the night in order to keep their stomata closed during the day. The closure of the stomata prevents the loss of water from the plant. This is especially important in hot, dry climates.
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All GRE Subject Test: Biology Resources
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