Question

Which of the following groups belongs to the alternative eight kingdom system of classification
A. Bacteria and archaea
B. Bacteria and Protista
C. Archaea and Protista
D. Archaea and Euarchaea
E. Euarchaea and Protista

Answer 1

Hint: The eight kingdom system of classification was given by Thomas Cavalier-Smith. The eight kingdom system of classification includes the kingdom Eubacteria, Archaebacteria, Archezoa, Protozoa, Chromista, Plantae, Fungi, and Animalia. This classification is the revised version of the five kingdoms of classification given by R.H.Whittaker.

Step by step answer:Thomas Cavalier-Smith is a Professor of Evolutionary Biology in the Department of Zoology, at the University of Oxford. He proposed the major classification system by dividing all the organisms into eight kingdoms. He gave the eight kingdom system of classification by revising Whittaker's five kingdoms of classification.
He kept Archaebacteria as a separate group from Bacteria. Some protists lacking mitochondria were separated from the protist kingdom and are kept separately making Kingdom Archezoa.
The eight kingdoms include the following: Eubacteria, Archaebacteria, Archezoa, Protozoa, Chromista, Plantae, Fungi, and Animalia.
However, the kingdom Archezoa is now no longer in use. The members of the kingdom Archezoa now belong to the phylum Amoebozoa.
Bacteria- they are prokaryotic microorganisms having numerous shapes like, from spheres to rods and spirals. Bacteria was one of the first life forms to appear on Earth.
Archaea- these are the single-celled organisms that lack nuclei and therefore are prokaryotic. They were classified as bacteria hence the name Archaebacteria.
Hence option A is correct.

Note: There were different kingdom system proposed by different scientists these are: Two kingdoms by Linnaeus, Three kingdoms by Haeckel, Four kingdoms by Copeland, Five kingdoms by Whittaker, Six kingdoms by Carl Woese, and others.