Which of the following is NOT classified under Kingdom Animalia?

Correct Answer: 2)

Concept:

• The living organisms are divided into five different kingdoms namely: Monera (Unicellular, Prokaryotic), Protista (Unicellular, eukaryotes), Fungi (unicellular as well as multicellular, eukaryotes), Plantae (Multicellular, eukaryotic), and Animalia (Multicellular, eukaryotic). 

• Members of Protista are Chrysophytes, Dinoflagellates, Euglenoids, Slime moulds, and Protozoans under Protista.

Explanation:

Option 2: 

• Protozoans are unicellular, eukaryotic organisms.
• They are believed to be primitive relatives of animals.
• Earlier, protozoans were regarded as "one-celled animals", because they often possess animal-like behaviors, such as motility and predation.
• In the classical system, they were placed in the kingdom Animalia but later Ernst Haeckel proposed a third kingdom of life, which he named Protista.
• Ernst Haekel included eukaryotes that are not animals, plants, or fungi and adopt a heterotrophic mode of nutrition.

​Option 1

• Metazoa is classified under Kingdom Animalia.
• All multicellular animals besides sponges are metazoans.
• Metazoan animals are heterotrophic in nature.

Option 3:

• Choanozoa is classified under Kingdom Animalia.
• These are funnel-shaped animals.

Option 4

• Pipiens are classified under phylum Arthropoda, Kingdom Animalia.
• Culex pipiens, commonly referred to as the common house mosquito, is a species of mosquito.

So, the correct answer is option 2.