What do plants breath at night?

At night, most plants switch from photosynthesis to respiration, taking in oxygen and releasing carbon dioxide. This process occurs because there is no sunlight for photosynthesis, which typically produces oxygen. However, some plants, like succulents and certain orchids, continue to uptake carbon dioxide at night through a process called CAM (Crassulacean Acid Metabolism) photosynthesis. Overall, the primary gas plants "breathe" at night is oxygen.