The growth of the pollen tube towards the ovule induced by a sugary substance as stimulus is

Phototropism

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Chemotropism

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Thigmotropism

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Geotropism

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Solution

The correct option is A Chemotropism
Chemotropism is the growth or movement of a plant or plant part in response to a chemical stimulus. An example is the growth of a pollen tube down the style during fertilization in response to the presence of sugars in the style.
Phototropism - light
Thigmotropism - touch
Geotropism - gravity
Therefore, the correct answer is option B.

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