Yes. A plant makes its water and nutrients through photosynthesis where both sunlight and carbon dioxide produce the green chlorophyll we see in its leaves. A plant also takes in water and nutrients through its roots, pulling it to the top through capillary action. Molecules in the water bind to molecules in plant issue, transporting the water and food along the stem and into the leaves. This fluid also plumps up plant tissue to keep it rigid and able to stand up. It is called "turgor." Excess water evaporates through pores in the leaves in a process called transpiration. It is much like the cooling process of human perspiration. Plants are good for the environment because they use the carbon dioxide we exhale and convert it to oxygen.