Have you ever noticed that a potted plant kept near a window will slowly bend and grow towards the sunlight? This directional movement of a plant part in response to light is called Phototropism. Let's see exactly how it happens.
Definition: Directional growth of a plant towards light.
Key Hormone: Auxin.
Mechanism: Auxin collects on the shady side, causing those cells to elongate faster, which pushes the plant to bend toward the light.
Phototropism occurs due to the action of a plant hormone called Auxin.
Phototropism occurs when light falls on one side of a plant. The hormone auxin accumulates on the shady side of the stem, causing the cells there to elongate faster. This uneven growth makes the plant bend toward the light.
The plant hormone responsible for phototropism is Auxin.
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