Which Plants Store CO₂ in the Form of Malic Acid

Question

Which plants store CO₂ in the form of malic acid and close their stomata during the day?
A) C₃ plants
B) C₄ plants
C) CAM plants
D) hornworts and liverworts

Accepted Answer

CAM plants (Crassulacean Acid Metabolism) store carbon dioxide as malic acid during the night and close their stomata during the day to conserve water, then use the stored CO₂ during the day for photosynthesis. C₃ and C₄ plants do not use malic acid as a storage molecule, and hornworts and liverworts are not known for their carbon storage mechanisms.