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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Word of the day
3 Amino 1,2,4 triazole
- non-selective post-emergence, translocated herbicide. According the Seventh Annual Report on Carcinogens (PB95-109781, 1994) this substance may reasonably anticipated to be a carcinogen. (From Merck Index, 12th ed) It is an irreversible inhibitor of CATALASE, and thus impairs activity peroxisomes.