How do planted seeds know which was is up?
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Plants have a built-in sense of which way is up, and they use it to direct their roots downward and their shoots upward. This ability, called geotropism, comes from the uneven distribution of a plant hormone called auxin. Auxin is produced in the tips of growing plants, where it helps to regulate cell growth. It also plays a role in phototropism, or a plant’s response to light. When auxin accumulates on one side of a plant Shoot tip ,it causes that side of the plant to grow more quickly than the other side. As a result, the shoot bends away from the source of light
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