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What is chemotropism? Give one example. Name any two plant hormones and mention their functions.

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Chemotropism is the movement of a part of the plant in response to a chemical stimulus. It can be positive chemotropism or negative chemotropism. Example: The growth of pollen tube towards a chemical which is produced by an ovule during the process of fertilisation in a flower. Two plant hormones with their functions are as follows: Auxins promote cell elongation, root formation, cell division, respiration and other physiological processes like protein synthesis, etc. 

Gibberellins stimulate stem elongation, seed germination and flowering.

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