The growth of a pollen tube towards ovule is caused by _________.

Phototropism

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Hydrotropism

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Gravitropism

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Chemotropism

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Solution

The correct option is D Chemotropism
The movement of a plant or its parts in response to chemical stimuli is called chemotropism.
When a pollen grain comes in contact with the stigma, the ovary produces a positive chemical response for the pollen grain. This helps the pollen tube to grow towards the ovary for the process of fertilization.
Thus, the correct answer is option D.

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Question 18
The growth of pollen tubes towards ovules is due to

(a) hydrotropism
(b) chemotropism
(c) geotropism
(d) phototropism

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