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Potato and Tapioca store starch rich foo...

Potato and Tapioca store starch rich food in underground tubers. We consider potato as stem modification and tapioca as root modification . Why?

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Potato has a modified stem which grows on underground stems which have the capacity to grow as a whole plant. But tapioca has a modified food storage roots of fibrous roots and root filled with food.
Also potato tubers have buds that sprout leaves and stems from them while tapioca roots do not posses these properties.
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