Roots - towards moisture
-towards gravity = positive geotropism
Shoots - towards light = positive phototropism
- away from gravity = negative geotropism
Auxin - plant hormone that controls tropisms
Auxin is produced in the shoot or root tip, then travels to the target cells. It causes shoot cells to elongate, and inhibits elongation in root cells.
The unequal distribution of auxin causes unequal growth rates.
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