Heterotrophic nutrition is a characteristic of the group ..........

Which of the following organisms possesses cilia?

Statement $X$: Presence of a rigid cell wall and nucleoprotein as genetic material.
Statement $Y$: Examples include $Euglena$,$Dinoflagellates$,$Amoeba$,and $Paramecium$.

What is Plasmodium and what does it form?

In which group of organisms do the cell walls form two thin overlapping shells that fit together?

Select the correct option for the following statements:
$(i)$ The sea appears red or golden when red dinoflagellates multiply rapidly.
$(ii)$ $Euglena$ / $Slime$ $molds$ are saprophytic protists.