Question

In five kingdom classification, single-celled eukaryotes are included in
A. Fungi
B. Protista
C. Monera
D. Archaea

Answer 1

Hint: Classification is the foundation of a progressive arrangement of categories based on regular connections that exist among various life forms. We all know that the five-kingdom classification is the most widely accepted mode of classification. Eukaryotes are organisms that have distinct cellular organization.

Complete answer:
We should study the five-kingdom classification and how the single-celled eukaryotes have been classified. We place all single-celled eukaryotes under Protista. Be that as it may, the limits of this realm are not very much characterized. Individuals from Protista are essentially oceanic. Protists have vast varieties of creatures. While special cases exist, they are tiny and unicellular or composed of a solitary cell. The cells of protists are profoundly coordinated with a nucleus and concentrated cell machinery called organelles or cell organelles. This kingdom frames a connection with the other plant creatures and their growth. Being eukaryotes, the Protista cell body contains a very much characterized nucleus and other layer bound organelles. Protista comprises all unicellular and colonial eukaryotes, accompanied by the exception of red and green algae.

We can characterize unicellular protists into three significant gatherings:
1.Photosynthetic Protists Model: Dinoflagellates, Diatoms, Euglenoids
2.Consumer Protists Model: Slime molds or Myxomycetes
3.Protozoan Protists: Zooflagellate, Sarcodina, Sporozoa, Ciliata

We know that the eukaryotic organisms differ from the prokaryotes in having a well-defined nucleus and also membrane-bound organelles. The organelles include mitochondria, endoplasmic reticulum, Golgi bodies, and chloroplasts. Therefore, we can also call Protista the kingdom of unicellular eukaryotes. We also know that in kingdom fungi, achlorophyllous, spore-producing heterotrophic, multinucleate organisms are present. Monerans have prokaryotes and thus, are the most primitive among all the kingdoms. Archaea are ancient bacteria. They are also similar to that of the monerans and prefer to flourish in a primitive environment such as high temperature, high salt content, etc.

Hence, the correct answer is option (B)

Note: We now know that in five kingdom classification, single-celled eukaryotes are included in Protista. It comprises all unicellular as well as colonial eukaryotes, accompanied by the exception of red and green algae. Kingdom fungi, achlorophyllous, spore-producing heterotrophic, multinucleate organisms are present while kingdom Monera is the home to prokaryotes and thus, is the most primitive among all the kingdoms.