Bulbs and tubers are roots

Bulbs and tubers are underground stems and they are not roots.

Explanation:

A bulb is an underground storage organ formed from the plant stem and leaves. The body of the bulb is made up of layers of fleshy scales said to be leaves and at the bottom of the bulb is thin, flat disc called basal plate which is a compressed stem and the roots grow from this. The examples of bulbs are onions, tulips, narcisuss and lilies.

Tubers are food and energy storage structure like true bulbs. They are enlarged stem tissue and do not have a basal plate or papery tunic. The examples of tubers are potatoes, begonias and dahlias.

Thus Bulbs and Tubers are underground stems and are not roots.