Select the correct option for $Protista$:

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?

Which organism is structurally and functionally unicellular?

The maximum biomass of living diatoms is found in:

The protists used in the construction of soundproof rooms are . . . . . . .

The transverse groove present in dinoflagellates is: