The roots of a plant serve several purposes. One is to anchor the plant into the soil. They also serve as probes for moisture and minerals. A third function is to absorb water and minerals and send it up to the plant.
There are two main kinds of roots–the primary root and the secondary roots, which include hair roots. Within the plant, fats and proteins are made by chemical changes in the sugars and starches.
The stem, or trunk in the case of trees, is like a highway carrying supplies to the plant. It is through the leaves that carbon dioxide is absorbed and oxygen given off. It is also the job of the leaves to collect sunlight, which is needed to make food. Leaves are often flat so as to expose more surface area and seem to arrange themselves in ways that allow them to collect the light. Tendrils are wispy offshoots of the stem that reach up or out and may act as coils to attach the plant to something.
Finally, the blossom of a flowering plant is actually a seed factory. It uses the food the plant has produced to form seeds.
