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Red tides in the sea are caused by rapid growth of:

ADeuteromycetes
BDiplobacteria
CDesmobacteria
DDinoflagellates
Answer & Solution
Correct answer: D. Dinoflagellates
1. These marine protists carry red pigments. 2. Gonyaulax is a well known example. 3. Their bloom turns the sea red. _Source: syllabus Biology, Ch 2 'Biological Classification'_
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