In CAM plants, such as cacti,
a. the stomata are open both day and night.
b. the stomata are open during the day to let in
carbon dioxide even though they cannot afford
to lose the water.
c. stomata are absent because water loss through
them is too great.
d. stomata open at night.
e. guard cells are present but operate the reverse of
the guard cells of non-CAM plants.
Answer: d
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What will be an ideal response?