Question

Who proposed the three-domain system of classification?
(a)R.H.Whittaker
(b)Carl Woese
(c)Haeckel
(d)John ray

Answer 1

Hint: The three domains system was divided on the basis of cellular life. He was first to define the archaea group. He also gave the concept of the RNA world and was an American microbiologist.

Complete answer:
The three-domain system is Euķarya, Bacteria, and Archae given by Carl Woese. R.H.Whittaker gave five domain systems including Monera, Protista, Fungi, Plantae, and Animalia. Haeckel proposed three kingdoms which include Animalia, Plantae, and Protista. John Ray gave the classification of the plant into cryptogams, monocotyledons, and dicotyledons.

Additional Information:
In Carl Woese, the Eukarya domain includes protists, fungi, plants, and animals. The Bacteria domain includes cyanobacteria and heterotrophic bacteria. In Archaea, the domain includes halophiles and thermophiles.
-Carl Richard Woese was a microbiologist and biophysicist.
-He was able to define a domain life Archaea.
So, the correct answer is, “Carl Woese.”

Note:
-The six kingdom system classification is divided into- Eubacteria, Archaebacteria, Protista, Fungi, Plantae, Animalia.
-Classification of a system where two domains- the prokaryotes i.e. bacteria and the Eukaryotes i.e. animal, plant, fungi and protist, and five-kingdom- Miners, Protista, Fungi, Plantae and Animalia co-exist is termed as ‘five kingdom and three domains’.
-The current classification of the system is based on the difference in ribosomal RNA consisting of three domains.