nastic movement in polen tubes towards chemicals
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The movement in response to the external chemical is called as chemotropism. The movement of pollen tube towards embryo sac is chemotropism as it occurs in response to certain chemical substances like auxin and carbohydrates. Movement of the organism towards or away from the heat is called as thermotaxis. Nastic movement shown by the organism in response to the heat is called as the thermonastic movement. The movement in response to the water is called as hydrotropism.
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CHEMOTROPISM
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