Why can potatoes and onions continue to grow sprouts while in dry storage?

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Why can potatoes and onions continue to grow sprouts while in dry storage?

In: Biology
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You mean like why can they do that while most plants require soil, water, and light to sprout? It’s because the energy needed to launch a sprout was already captured and is stored in the potato/onion. Potatoes are a root vegetable and they are created as energy stores. Thus the energy needed to launch a sprout is already there.