All eukaryotic unicellular organisms belong to
1.  Monera

2.  Protista

3.  Fungi

4.  Bacteria

(b) All eukaryotic unicellular organisms belong to Protista. The organisms included in this group are either photoautotrophs, heterotrophs or parasites.
Monera includes prokaryotic like bacteria, unicellular organism.
Fungi are eukaryotic but are mostly multicellular (exception yeast is unicellular).