When a seed germinates, how does it knows which direction is up?
In: 90
Plant cells produce dense starch structures inside themselves, which are pulled toward the bottom of the cell by gravity. This causes a plant hormone called auxin to be released — in root cells, this is in the direction of gravity; in shoots it’s the other way. Auxin then tells the plant cells which way to grow more in order to curve towards or away from gravity.
https://en.wikipedia.org/wiki/Amyloplast
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