Auxins and Plant Growth
Auxins are plant hormones that control growth in response to light (phototropism) and gravity (geotropism).
Where in the plant is auxin produced?
What is Auxins and Plant Growth?
"Auxin is a plant hormone which causes the elongation of cells in shoots and is involved in regulating plant growth."
Which plant response is explained by auxin causing unequal growth in a shoot?
In a plant shoot, what happens to auxin when light shines on one side?
In a plant shoot, what happens to auxin when light shines on one side?
Tropisms
Produced in the tips of shoots and roots.
In shoots: Auxin makes cells grow more (elongate) on the shady side, bending the shoot to light.
In roots: Auxin inhibits growth on the lower side, causing the root to bend downwards.
Auxin has opposite effects in the shoot (stimulates) compared to the root (inhibits).
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