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Find out what do the terms ‘algal bloom’...

Find out what do the terms ‘algal bloom’ and ‘red-tides’ signify

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In cyanobacteria : The colonies and trichomes or filaments are surrounded by gelatinous sheath which often forms blooms in polluted water bodies called algal blooms.
Ex : Nostoc, Anabaena. Red Dinoflagellates like "Gonyaulax" undergo rapid multiplication and make the sea "Red" so called Red Tides.
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