1.

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Answer»

1.PhototropismThe movement of a part of the plant towards light is called phototropism. Growth of aerial parts of a plant towards light is an example of phototropism.

2.Geotropism

The movement of a part of the plant towards gravity is called geotropism. Growth of roots of plants in downward direction is an example of geotropism.

3.Hydrotropism

The movement of a part of the plant towards water is called hydrotropism, e.g., movement of roots

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