Growth of pollen tubes towards ovule is an example of _________.

phototropism

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geotropism

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chemotropism

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thigmotropism

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Solution

The correct option is C chemotropism
Growth of plants towards or away from a stimulus is called tropism. Growth of plant parts in response to the stimulus, chemical ('Chemo') is called chemotropism. The pollen tubes grow towards the ovule in response to certain chemicals released by the ovules.

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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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