Parameter Tree:
EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PHOTOSYNTHESIS

Definition:
Photosynthesis is the synthesis of carbohydrates from carbon dioxide and water by chlorophyll using light as energy with oxygen as a byproduct.

Reference:
Krebs, Charles K. Ecology - 4th ed. 1994. HarperCollins College Publishers, New York, New York.