All parts of a plant need water, just as all parts of your body need water.

Actually, all living things need water because life requires a LOT of chemical reactions. The chemicals are usually dissolved in water. Also, plants put the water together with carbon dioxide to make sugar. This takes energy, which plants get from light. Water also helps plants stand up tall, even when they aren’t made of wood. They don’t have bones, but they do have cell walls and water pressure. Water comes up from the roots, but carbon dioxide doesn’t. How do you think plants get carbon dioxide?