why is food present in the roots of some plant although it is made in the leaves

Food is present in the roots although it is made in leaves because the plants play an important role in storing the food in any part of the plant such as root, stem, leaves, fruit etc. Examples are -
Root     carrot, radish
Stem     onion, potato
Leaves  spinach, lettuce, cabbage
Fruit     brinjal, tomato

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