Chemotropic stimulus to pollen tube is provided in the form of
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Chemotropism can be observed during the growth of the pollen tube towards the ovules. This is due to the ovary releasing chemicals that influence the development of pollen tubes. The roots growing towards useful minerals are also exhibiting chemotropism, i.e. positive.
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Chemotropism is defined as the growth of organisms navigated by chemical stimulus from outside of the organism. It has been observed in bacteria, plants and fungi. A chemical gradient can influence the growth of the organism in a positive or negative way
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