Significance

Without the sun, photosynthesis could not take place. The sun provides the initial energy that starts the cycle of photosynthesis, which converts this sun energy into food for plants.

Method

Along with sunlight, water and carbon dioxide are necessary for photosynthesis. A chemical reaction happens inside the chloroplasts of the plant cells, turning light, water and carbon dioxide into sugar, or carbohydrates, and oxygen.

Fun Fact

Human beings breathe oxygen and exhale carbon dioxide. Plants "breathe" carbon dioxide and "exhale" oxygen, which humans breathe.