Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce sugar, which cellular respiration converts into Adenosine-5′-triphosphate (ATP), the “fuel” used by all living things.
The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll.
Most of the time, the photosynthetic process uses water and releases the oxygen that we absolutely must have to stay alive. Oh yes, we need the food as well!
Plants are the only photosynthetic organisms to have leaves (and not all plants have leaves). A leaf may be viewed as a solar collector crammed full of photosynthetic cells.
The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf.
Photosynthesis Animations
Light Reactions Sunlight is required
Dark Reactions No sunlight is required
Photosynthesis Experiment
Making Oxygen through Transformation of Energy
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