Split a bulb in half and you will see this clearly. DRAW a picture of an onion. Have an adult cut one in half for you. Drawing is a great way to learn to see like a scientist. A scientist has to observe details.
Yellow onions are a common sight in most people's kitchens.
Onions are said to be good for your health. Parts of the bulb have special names. Scientists and gardeners need to know the correct vocabulary so they can talk clearly with others about the bulbs . This drawing from De Hertogh, A.A. and M. Le Nard. 1993. The Physiology of Flower Bulbs.