Which of the following is a sexual mode of reproduction in protozoa?

Trypanosoma belongs to the class ..........

Describe the characteristic features of kingdom Protista and also describe its groups.

What is common between Amoeba and Paramecium?

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?

In which organism is silica present in the cell wall?