Question

How does CAM photosynthesis differ from C3 or C4

• A. Malic acid is formed at night, stored in vacuoles in cells housing chloroplasts
• B. CAM photosynthesis continues at night while C3 and C4 photosynthesis occur during the day
• C. CAM photosynthesis extracts carbon from organic compounds
• D. CAM plants must use large quantity of water for photosynthesis

Answer 1

The correct option is B CAM photosynthesis continues at night while C3 and C4 photosynthesis occur during the day

During CAM photosynthesis, organisms absorb sunlight energy during the day, then use the energy to fix carbon dioxide molecules during the night. During the day, the organism's stomata close up to resist dehydration, while the carbon dioxide from the night prior undergoes the Calvin cycle.
​C4 photosynthesis is a two-stage process in which a four-carbon intermediate compound, malic acid is produced. The photosynthetic process occurs in the chloroplast of a thin-walled mesophyll cell. Once created, the intermediate compound is pumped into a thick-walled bundle sheath cell, where the compound is split to regenerate carbon dioxide. The carbon dioxide then undergoes the Calvin cycle, as in C3 photosynthesis.