Photosynthesis is the process in which living organism such as plant uses light energy to convert into chemical energy. The input is carbon dioxide(CO2), water (H2O), minerals, and sunlight and the output is carbohydrates (sugar and starch) and oxygen. All forms of life depends on photosynthesis. Autographs and photoautotrophs such as plants, protists, cyanobacteria, phytoplankton, and algae requires photosynthesis in order to make their own food.
Cellular respiration is a catabolic pathway that takes place in a cell or across the cell membrane in order to obtain biochemical energy from fuel molecules and the cell's waste products. Oxygen is consumed as a reactant along with the organic fuel. In cellular respiration, energy is released and stored as "high energy carriers" Animals use cellular respiration to take in in oxygen and create ATP and then exhale the CO2 as waste.
Photosynthesis and cellular respiration are similar because they both transform energy. In photosynthesis, sunlight energy is transformed into glucose in either the light reaction or the Calvin cycle. This is similar to Cellular respiration because in cellular respiration glucose is transformed into ATP through glycolsis or the oxidation of pyruvic acid. They also complement each other and they goes in a circle because in photosynthesis when oxygen is released, humans and mammals breath in that oxygen to start cellular respiration, which is used to break down glucose and as a result releases carbon dioxide as a byproduct. Also during photosynthesis and cellular respiration, electron transport chains and chemiosmosis play a role in the process of ATP. Photosynthesis has two electron transport chain compare to cellular respiration, which has only one.
http://sciences.aum.edu/bi/bi4523/student/cardwell/phvre.html
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