Question

Which of the following is most likely to occur in a leaf cell of a CAM plant during the day?

A. Entry of CO2 through the stomata
B. Exit of water through the stomata
C. Decarboxylation of malic acid
D. Fixation of CO2 by PEP carboxylase
E. Conversion of oxaloacetate to malate

Answer 1

During the day, the most likely occurrence in a leaf cell of a CAM plant is the exit of water through the stomata.

Step-by-step explanation:

In a leaf cell of a CAM plant during the day, the most likely occurrence is the exit of water through the stomata. CAM plants close their stomata during the day to minimize water loss by transpiration. This allows the plants to conserve water, especially during high daytime temperatures. Stomata in chlorenchymal (mesophyll) leaf cells open at night to take up CO2 and fix it by combining it with PEP (phosphoenol pyruvate) to produce malic acid that is stored in plant cell vacuoles.