Growth of pollen tube towards the ovule is known as:

Phototropism

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Geotropism

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Hydrotropism

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Chemotropism

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Solution

The correct option is C Chemotropism
Plants respond to stimuli and show certain types of movements. During fertilization (a reproductive stage), when a pollen grain is dropped on the stigma, it grows a pollen tube in response to chemicals present on the stigma. The tube then moves towards the ovule. So, the correct answer is option D.

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