Biology / Bio 2555 · Atom · ~20 seconds
Gravitropism
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Gravitropism orients growth to gravity: shoots show negative gravitropism, growing upward, while roots show positive gravitropism, growing downward, both mediated by settling starch-filled amyloplasts.
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A plant laid on its side redirects shoot growth upward within hours as amyloplasts settle to the new lower cell wall.
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"Positive" and "negative" describe direction relative to gravity's pull, not a value judgment about usefulness.