Paul Andersen explains the process of photosynthesis by which plants and algae can convert carbon dioxide into useable sugar. He begins with a brief. Nevertheless, it was required, and at least it was more fun than studying algebra or photosynthesis. This website is down for planned server maintenance. We apologize for any inconvenience and thank you for your patience. Why do leaves change color in Fall? Learn why leaves change color and fall off the trees in autumn. Plus, get great science projects. Photosynthesis has two main sets of reactions. Light-dependent reactions need light to work; and light-independent reactions, which do not need light to work. More information on plants, carbon dioxide, and photosynthesis from the know-it-all expert Dr. Galapagos. Do all plants use carbon dioxide? Friday, December 10, 2010 Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the Sun, into chemical energy that can be later released to fuel. Illuminating Photosynthesis. By Rick Groleau; Posted 11.01.01; NOVA; Photosynthesis in plants and a few bacteria is responsible for feeding nearly all life on Earth. Why Do Plants Need Photosynthesis & Cellular Respiration?. During photosynthesis, plants produce the substance they require to survive and store it until they need it.