What is the nature of cell-walls in diatoms?

Match the following columns:

Column-$I$ (Protozoans)	Column-$II$ (Examples)
$P$. Amoeboid	$I$. Plasmodium
$Q$. Flagellated	$II$. Amoeba,Entamoeba
$R$. Ciliated	$III$. Paramoecium
$S$. Sporozoans	$IV$. Trypanosoma

In which of the following is a contractile vacuole $NOT$ found?

What is the similarity between a trophozoite and an amoeba?

Which of the following characteristics is common to all protists?

Which of the following are the characters of dinoflagellates?
$(i)$ They are planktonic golden yellow algae with soap box like structure.
$(ii)$ They are marine biflagellated protista.
$(iii)$ They appear yellow,green,brown,blue and red in colour.
$(iv)$ The cell wall has stiff cellulose plates on the outer surface.
$(v)$ They are saprophytic (or) parasitic unicellular forms.