Classify organisms of kingdom $Protista$ on the following basis and give an example of each:
$(a)$ Based on structure for locomotion.
$(b)$ Based on mode of nutrition.

(N/A) Based on the structure for locomotion:
$(i)$ Organisms having pseudopodia,e.g.,$Amoeba$.
$(ii)$ Organisms having hair-like cilia,e.g.,$Paramecium$.
$(iii)$ Organisms having whip-like flagella,e.g.,$Euglena$.
$(b)$ Based on the mode of nutrition:
$(i)$ Autotrophic: $Chlamydomonas$.
$(ii)$ Heterotrophic: $Oomycetes$ (or $Amoeba$ as a holozoic heterotroph).