Science fair season is coming up. Many kids want to work with plants. One set of experiments that’s common is trying to grow seeds in a variety of media, such as water, milk, and cola. The seeds will sprout in all of those conditions, but they won’t grow well as a plant in all of them. Another experiment is more of a demonstration, and that is trying to grow a variety of fruits and vegetables from table scraps. In this case, it’s important to know which parts of a plant are capable of growing. The basic parts of a plant are the root, stem, leaf, flower, fruit, and seed. It should be obvious that a new plant will grow from a seed. If you stab an avocado seed with toothpicks and balance it atop a glass of water, it should sprout and grow. It may not be as obvious, but …