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- Plants demonstrate phototropism through the following mechanisms1234:
- Positive phototropism: Shoots bend toward the light source.
- Negative phototropism: Roots grow away from the light source.
- Auxin, a hormone, plays a key role in phototropism.
- Photoreceptors, such as phototropins, receive light and initiate responses.
- Auxin moves to the darker side of the stem when exposed to light4.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.One important light response in plants is phototropism, which involves growth toward—or away from—a light source. Positive phototropism is growth towards a light source; negative phototropism is growth away from light. Shoots, or above-ground parts of plants, generally display positive phototropism—they bend toward the light.www.khanacademy.org/science/biology/plant-biolo…Phototropism is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light contain a hormone called auxin that reacts when phototropism occurs. This causes the plant to have elongated cells on the furthest side from the light.en.wikipedia.org/wiki/PhototropismProcess of phototropism:
- Leaf tips and stem tips have a hormone called auxin which is sensitive to light.
- It allows the plant to positively grow towards the light source.
- This is called positive phototropism.
byjus.com/question-answer/how-does-phototropis…The mechanism of phototropism is as follows:
- Light of wavelength 450 nm illuminates the plant.
- The photoreceptor receives the light, reacts to it, and initiates a response.
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