The leaf is one of the most important organs of a plant. Leaves produce food for the plant through a process called photosynthesis. The leaves of different plants vary widely in size, shape and ...

Click on the right arrow to take a closer look at one of the trichomes on the leaf. Biology in the background Leaves are surprisingly complex structures that do more than gather food from sunlight.

This allows it to convert carbon dioxide and water into glucose. This glucose is: After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.