2, 4-7 Although deep intramuscular injection into a large muscle is the preferred parenteral route of administration, promethazineâs product labeling states that it may be given by slow IV push, which is the typical method of administration in most hospitals.
Quick Answer. Plants produce oxygen as a byproduct of photosynthesis, the process that plants and other organisms use to create usable energy. Photosynthesis consists of carbon dioxide and water reacting in the presence of energy from sunlight, which produces glucose and oxygen.
The Carbon Dioxide then turns into Oxygen (O2)  and the Water turns into Glucose  (C6H12O6) which is a type of  Sugar.   With the Glucose that was made in Photosynthesis, the plant will  use it to turn it into energy. This action is called Respiration.