Photosynthesis also produces the that feed the plant. Use by green plants of the in sunlight to carry out, such as the conversion of into. Photosynthesis pho·to·syn·the·sis (fō'tō-sĭn'thĭ-sĭs) n. Created by Dr. Michael Pidwirny & Scott Jones University of British Columbia Okanagan Biology refers to the science of living organisms. This Buzzle article is a complete compilation of Botany, Zoology, and Microbiology terms for your reference. The process in green plants and certain other organisms by which carbohydrates are synthesized from carbon dioxide and water using light as an energy source.