DENDROLOGY

Detailed explanation-1: -Plants respire in both day and night same as human being and photosynthesis only occurs during the day.

Detailed explanation-2: -Respiration must not be mistaken for photosynthesis. Respiration occurs all through the day, but the photosynthesis process occurs in the daytime, in the presence of sunlight only. Consequently, respiration becomes evident at night time in plants.

Detailed explanation-3: -Respiration and photosynthesis both occur during the day. However, at night only respiration occurs which consumes oxygen.

Detailed explanation-4: -It is well known that plants photosynthesise in the presence of sunlight, consuming carbon dioxide, water and energy, and producing glucose and oxygen. The reverse reaction, respiration, goes on all the time, consuming glucose and oxygen, and providing the plant with energy, whilst releasing water and carbon dioxide.