The leaf is one of the most important organs of a plant. Leaves produce food for the plant through a process called photosynthesis ... a leaf reveals its complex structure. The waxy cuticle ...

During photosynthesis ... of the leaf that contain starch turn the iodine from brown to blue/black. Variegated leaves have green parts (where the cells contain chlorophyll) and white parts ...

Plant leaves need a large surface area to capture sunlight for photosynthesis ... genetic mechanisms control leaves' growth ...