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What is phototropism ?...

What is phototropism ?

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The growth or orientation of an organism in response to light, either towards the source of light (positive phototropism) as seen in sunflower, or away from light (negative phototropism) as in case of the root of plants.
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Identify the correct statements from the below i. Catla, Rohu and Mrigal occupy different ecological niches. ii. According to Jordon, in some aquatic environments, lower the temperature, more the vertebrae. iii. Euglena shows phototropism. iv Grasslands are a major source for the logging industry.

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