The movement of pollen tube of angiosperms and gymnosperms towards the female gametophyte is an example of _______ movement.

phototropic

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chemotropic

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hydrotropic

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geotropic

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Solution

When pollen grains fall on the stigma, it starts germinating. The pollen tube grows towards the sugar and peptone secreted by the neck canals of the female gametophyte. Since this movement is in response to a chemical, this movement is called chemotropic movement.

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(b) chemotropism
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(d) phototropism

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(b) hydrotropism

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Question 10
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(b) hydrotropism
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(d) phototropism

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