摘要：Hydra (Cnidaria) is a cosmopolite freshwater invertebrate that establishes symbiosis with unicellular algae. Its simple body is comprised of three layers: epidermis, mesoglea and gastrodermis. The goal of this research was to determine the effect of flavonoids quercetin and naringenin upon hydra – alga symbiosis, to determine how motivated teachers are to perform such a mode of teaching and whether this motivation depends on their age, years of working experience, the school they work in, available time, space and material. An anonymous survey on a sample of 100 biology teachers was used in the research. Hydras and algae were treated with quercetin and naringenin in concentrations of 0.2, 0.25 and 0.3 gL−1 and compared to the control, and Chlorella bioassay was used. Morphological changes included migration, reaction to mechanical stimuli, asexual reproduction, secretion of mucus and mortality. Cyto-histological analysis revealed changes of all three layers and growth inhibition. Naringenin exerted altogether higher impact than quercetin. Survey results indicated that teachers are willing to use this experiment in school, and that most schools have the minimum required equipment. Because of the possibility of adapting this experiment in different temporal and spatial conditions, its performance in school is suggested.
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