Suppose you accidentally find an old preserved permanent slide without a label. In your effort to identify it,you place the slide under a microscope and observe the following features:
$(a)$ Unicellular
$(b)$ Well-defined nucleus
$(c)$ Biflagellate - one flagellum lying longitudinally and the other transversely.
What would you identify it as? Can you name the kingdom it belongs to?

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(A) $\rightarrow$ The organism described is a Dinoflagellate. Dinoflagellates are unicellular eukaryotic organisms that possess two flagella,typically arranged with one lying longitudinally and the other transversely in a furrow between the cell wall plates.
$\rightarrow$ Dinoflagellates belong to the Kingdom Protista.

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