Question

The common feature in CAM and $C_4$ plants is

• A. Stomata open only during night
• B. Acid concentration increases during night
• C. Both $C_3$ and $C_4$ pathways occur
• D. Having Kranz anatomy

Answer 1

Answer: (C)

Both $C_3$ and $C_4$ pathways occur

A) Stomata are open both during the day and night in $C_4$ plants, but open only at night in CAM plants.

B) The acid in $C_4$ plants decreases at night.
C) In both CAM and $C_4$ plants, $C_4$ pathway takes place followed by $C_3$ pathway.

D) Only $C_4$ plants have Kranz anatomy.
So the correct answer is 'Both $C_3$ and $C_4$ pathways occur'.