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How does phototropism occur in plants!?
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How does phototropism occur in plants!?
The directional movement of a plant in response to light is called phototropism. The shoot responds by bending towards light and roots respond by bending away from light.
This happens as follows:
(i) When sunlight falls straight on the plant, the auxin hormone synthesised at the tip of the stem spreads uniformly down the stem and due to equal concentration of auxin, stem grows straight.
(ii) 
When sunlight fells on only one side of the plant, the auxin diffuses towards the shady side of shoot. The concentration of auxin stimulates the cells to grow longer. Therefore, the stem appears to bend towards the source of light.



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Most Upvoted Answer
How does phototropism occur in plants!?
Phototropism is a directional growth which occurs in response to unidirectional exposure to light. ... Due to the presence of more auxin, the part of the plant stem in the dark grows faster, causing it to bend towards the source of light.
Community Answer
How does phototropism occur in plants!?
The movement of plant or other organism in response to light is called as phototropism. The movement can be either towards the light or away from it. Stem grows in direction of the sunlight (positively phototropic) and roots grows away from it (negatively phototropic). The growth is controlled by plant hormone, auxin. The growth of the side of the shoot is stimulated by the concentration of auxin. Bending of the stem is caused by the unequal growth on the two sides of the shoot. Phototropic movement is generally caused by the increased auxin on the dark side and lesser auxin on the illuminated  side.
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How does phototropism occur in plants!?
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