Multiple Choice
Which of the following actions occurs in many plants when CO2 concentrations are high?
A) Guard cells lose turgor,and the stomata close.
B) Water evaporates at a higher rate than usual.
C) CAM photosynthesis fixes CO2 at night.
D) Oxygen is used by plants for photosynthesis.
E) Calcium ions are transported faster through the phloem.
Correct Answer:

Verified
Correct Answer:
Verified
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