Photosynthesis happens when water is absorbed by the roots of green plants and is carried to the leaves by the xylem, and carbon dioxide is obtained from air that enters the leaves through the stomata and diffuses to the cells containing chlorophyll.

When and where does photosynthesis occur?

Photosynthesis, a plant's internal process that converts light energy into food, takes place mostly in the leaves of plants. Plants and trees utilize specialized structures to conduct the chemical reactions necessary to transform sunlight into chemicals the plant can use.

What indicates occurrence photosynthesis?

The presence of starch in leaves indicates the occurrence of photosynthesis. The starch is also a carbohydrate.