DENDROLOGY

Detailed explanation-1: -Photosynthesis does not occur in the leaves at night. As a result, oxygen diffuses into leaves from the air and carbon dioxide diffuses out into the air during the respiration process. At night, oxygen diffuses in and carbon dioxide diffuses out, resulting in a net gaseous exchange in leaves.

Detailed explanation-2: -At midnight, what is happening in the leaf of a plant? At midnight, photosynthesis stops (due to no sunlight), however, cellular respiration continues (breaking down of sugars—> transforms into ATP).

Detailed explanation-3: -While at night, the plants uptake oxygen and release carbon dioxide, which is called respiration. However, some plants can uptake carbon dioxide during the night as well because of their ability to perform a type of photosynthesis called Crassulacean Acid Metabolism (CAM).

Detailed explanation-4: -Plants carry out photosynthesis only during the day and respiration only at night.