Q. Which is not a root?

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Solution:

Carrot, turnip and radish are the tap root modification meant for storage. Stem also modified to perform special functions, and potato is an example of underground stem modification that stores food.
Potato or tuber is a modified stem having axillary buds that arise from the node region. Sprouts arise from potato is known as buds or eyes. In warmth and moisture conditions, they begin to sprout and entire stems are formed with the root at the base and leaves at the top.