TROPISMS
\tɹˈɒpɪzəmz], \tɹˈɒpɪzəmz], \t_ɹ_ˈɒ_p_ɪ_z_ə_m_z]\
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The directional growth of an organism in response to an external stimulus such as light, touch, or gravity. Growth towards the stimulus is a positive tropism; growth away from the stimulus is a negative tropism. (From Concise Dictionary of Biology, 1990)
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