Question

how do phototrophism occur in the plants​

Answer 1

Answer:

The directional movement of a plant in response to light is called phototropism. ... (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

Answer 2

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★ 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.

★ Phototropism is the growth of an organism in response to a light stimulus. 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 have a chemical called auxin that reacts when phototropism occurs.

★ 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:

• 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.

• 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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