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What a Plant Knows

What a Plant Knows

Daniel Chamovitz

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How Do Plants Know Which Way Is Up And Which Way Is Down? Robert Krulwich wonders

Think of a seed buried in a pot. Like this one:

One
Robert Krulwich/NPR
 

It's dark down there in the potting soil. There's no light, no sunshine. So how does it know which way is up and which way is down? It does know. Seeds routinely send shoots up toward the sky, and roots the other way. Darkness doesn't confuse them. Somehow, they get it right...

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