Question

Which part of a plant is an onion?

Answer 1

Hint: The onion, also known as the bulb onion or common onion, is a vegetable that belongs to the genus Allium and is the most widely cultivated species. The shallot is an onion botanical variety. The shallot was classified as a separate species until 2010.

Complete answer:
The onion plant has a fan of hollow, bluish-green leaves, and when a certain day-length is reached, the bulb at the base of the plant begins to swell. The bulbs are made up of underground stems that have been shortened and compressed, encircled by fleshy modified scale (leaves) that envelop a central bud at the tip of the stem. The foliage dies down in the autumn (or spring in the case of overwintering onions).
The onions have been harvested and dried, and they are ready to use or store. The onion fly, onion eelworm, and various fungi that cause rotting are among the pests and diseases that can affect the crop. Some A. cepa varieties produce multiple bulbs, such as shallots and potato onions.
The onion isn't a root or a stem. It's a tunicate bulb with a clump of fleshy leaves on top. An onion is a type of underground stem structure that has been modified. The bulged leaf structure at the base of the onion plant stores its processed food. The onion is the bulged structure.
For at least 7,000 years, the onion plant has been cultivated and selectively bred. Although it is a biennial, it is commonly grown as an annual. Modern cultivars usually reach a height of 15 to 45 cm (6 to 18 in). The leaves are yellowish to bluish green and grow in a flattened, fan-shaped swath alternately. They have one flattened side and are fleshy, hollow, and cylindrical.

Thus, an onion is not a root or a stem. It's a tunicate bulb with a clump of fleshy leaves on top.

Note: Onions are grown and used all over the world. They are commonly served cooked as a vegetable or as part of a prepared savory dish, but they can also be eaten raw or used to make pickles and chutneys. When chopped, they have a strong odor and contain chemicals that can irritate the eyes.