Question

R.Q of the succulents can be

• A. 0
• B. 1
• C. 0.7
• D. Both (A) and (B)

Answer 1

The correct option is D Both (A) and (B)

CAM plants open their stomata only at night and absorbs $C{O}_2$, which then converted into malate by acidification. During night time oxygen is absorbed continuously but no $C{O}_2$ is evolved. There fore R.Q in night is zero. During day time, malate gets converted to $C{O}_2$ and $C_3$ photosynthesis occurs. During day time amount of $C{O}_2$ evolved is equal to the amount of $O_2$ absorbed. So, R.Q at day time is 1. Since succulents are CAM plants, their R.Q at night is zero and day is 1. Thus, option D is correct and other options are incorrect.