Weegy: Plants are living things and their metabolism constantly 'burns' food using Oxygen and producing CO2, they do this all the time, day and night.
However, during the day plant is bombarded by photons (i.e. light). [ The light allows the plant to photosynthesise, turning CO2 and water into Hydrocarbons for food and releasing Oxygen.
The amount of Oxygen produced is surplus to its metabolic requirements and is therefore released into ... (More)