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B
Hydrotropism
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C
Phototropism
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D
Chemotropism
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Solution
The correct option is D Chemotropism Chemotropism is defined as the movement caused by chemical stimulus in organisms such as bacteria and plants. An example of chemotropic movement is the growth of the pollen tube. The growth of the pollen tube is always towards the ovules. The response by the plant is termed positive if the growth is towards the stimulus or negative if the growth is away from the stimulus. Hence, conversion of flowers to fruits is an example of the same.