In cellular respirtion, glucose is broken down into carbon dioxide and water to release the energy )ATP) that is stored in this molecule during its formation by photosynthesis. Cellular respiration takes place at and in the mitochondria in 2 steps, called anaerobic and aerobic respiration. All organisms perform respiration all the time. Photosynthesis takes place in green plants and green algae but only during light hours. Photosynthesis requires carbon dioxide, water, and light energy to be converted into glucose in 2 series of reactions called the light and dark reactions.