'Red tides' are produced by massive blooms of which of the following?
A
Diatoms
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B
Red algae
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C
Dinoflagellates
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D
Brown algae
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Solution
The correct option is B Dinoflagellates Dinoflagellates are unicellular motile protists. Red tides are caused when a dinoflagellate population increases in huge numbers resulting in a condition called algal bloom. These blooms may become massive when carried long distances by winds, currents, storms or ships.