Where does atmospheric oxygen from?
Oxygen is a colourless odourless reactive gaseous element. Atmospheric oxygen (21 % by volume) is of vital importance for all organisms that carry out aerobic respiration. It is a reactive element; it reacts with most other elements during combustion oftentimes. So, where is the atmospheric oxygen from? Do you know any process by with oxygen is released into atmosphere? Photosynthesis is a chemical process by which green plants synthesize organic compounds from carbon dioxide and water in the presence of sunlight. It occurs in the chloroplasts (most of which are in the leaves) and there are two principal series of reactions. In the light reactions, which require the presence of light, energy from sunlight is absorbed by photosynthetic pigments (chiefly the green pigment chlorophyll) and converted into chemical energy. In the ensuing dark reactions, which can take place either in light or darkness, this chemical energy is used in the production of simple organic compounds from carbon di
