Photosynthesis is the process plants use to make food. Carbon dioxide plus water, in the presence of sunlight makes sugar/glucose (food) and oxygen.

6H2O + 6CO2 ----------> C6H12O6+ 6O2 (photosynthesis)

C6H12O6 + 02 ------------------------- CO2 + H2O + ATP (respiration)

Photosynthesis and respiration are the opposite of each other.
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http://www.homestead-farm.net/art/kidsArt/photosynthesis-color.jpg

Photosynthesis is also the process of converting light energy to chemical energy.

Most green plants carry on the process of photosynthesis.
Most plants carry out both respiration and photosynthesis.

Organisms that carry out photosynthesis usually contain a group of pigments called chlorophylls, which capture the light energy that hits
the leaves. Organisms that carry out photosynthesis are usually green in color, because of the chlorophyll.


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http://www.hln-store.com/catalog/photos.gif

During the process of photosynthesis, green plants take in carbon dioxide and water to produce oxygen and glucose.
Carbon dioxide and water are needed by a plant to carry out photosynthesis.


Green plants carry out photosynthesis and respiration at the same time.