Plants produce energy by the process of photosynthesis. Photo courtesy of Christy C/Flickr.

Chemosynthesis: process that creates energy for ecosystems in the absence of sunlight. Uses chemicals (like sulfur), carbon dioxide, and water to create sugar and sulfur compounds.

when plants use sunlight, carbon dioxide and water to create sugars (energy) and oxygen to supply energy for ecosystems.

Respiration: opposite of photosynthesis. Plants use glucose (sugar) and oxygen and release carbon dioxide, water, and energy.
Last modified: Wednesday, 19 October 2011, 8:58 AM