Photosynthesis – The process of capturing light energy and converting it to sugar energy, in the presence of chlorophyll using carbon dioxide and water.
Respiration – The process of metabolizing (burning) sugars to yield energy for growth, reproduction, and other life processes.
Carbon di oxide + water + Light energy = Glucose + oxygen
Carbon di oxide = CO2
Water = H2O
Glucose = C6H12O6
Oxygen = O2
In respiration, plants (and animals) convert the sugars (photosynthates) back into energy for growth and other life processes (metabolic processes). The chemical equation for respiration shows that the photosynthates are combined with oxygen releasing energy, carbon dioxide, and water.