what is phototropism? give reason
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phototropism is the response of the shoot towards light. as it is growth related movement it is considered as a tropic movement. But the movement of sunflower head is not growth related so it is a Mastic movement
vamshi82:
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I didn't understand the reason can u pls xplain
the reason is that there are various receptors which react to the loght and move give a response
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Phototropism is a growth response to the stimulus of light. This is caused by auxin made in the shoot tip, which then moves down the stem.
When a shoot receives light from only one side, the auxin is unevenly distributed, where most of them are on the stem's shaded side. This results in the stimulation of cells on the shaded side to elongate more than the cells on the side in direct light, causing the the shoot to grow more on the shaded side and bend towards the light.
There are two types of phototropism: positive and negative.
Example of positive phototropism: A shoot growing towards the light
Example of negative phototropism: Roots growing away from the light
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