Multiple choice

The movement of pollen tube is called

  1. chemotropism

  2. thermotaxis

  3. thermonastic

  4. hydrotropism

  5. -

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A Correct answer
Explanation

The response of an organism or its part is termed 'positive' if the growth is towards the stimulus or 'negative' if the growth is away from the stimulus. An example of chemotropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovules.