The below are exceptions to the cancellation and revision fees policy: In the event of death, of the ticketed passenger, a refund will be processed for the deceased and any traveling companion(s). Request must include a copy of the death certificate and submitted within one year of the original date of issue.
Phycomyces, a fungus, exhibiting phototropism. A tropism (from Greek ÏÏÏÏÎ¿Ï, tropos, a turning) is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.
Home Â» Morphogenesis Â» Cellular differentiation Â» Physiological Â» Pigmentation Â» Tropism. Definition. noun, plural: tropisms. A movement or growth response of a cell or an organism to a stimulus, which may either be positive or negative depending on the source and kind of stimulation. Supplement. A tropism is generally an involuntary orienting response of an organism to a stimulus.