Question

Which kingdom is mismatched
A. Prokaryotes-virus
B. Protista-unicellular eukaryote
C. Plantae flower and mosses
D. Animalia-Arthropods and humans

Answer 1

Hint: R.H. Whittaker proposed five kingdom classification. He divided the kingdom into Monera, Protista, Fungi, Plantae, and Animals. Viruses are connecting links between living and non-living entities. They have the properties of both living and non-living things. Hence they are not included in the five kingdoms.

Complete answer:
Option A: Virus is a nucleoprotein entity that is able to utilize the synthetic machinery of a living cell of other organisms for its multiplication which does not involve growth and division. The virus is an obligate parasite. It is inert outside the host cell and called a virion. Viruses are living when they are inside the organisms, otherwise, they are non-living, so they do not classify under the kingdom.
Option B: All unicellular eukaryotes, irrespective of their mode of nutrition, are included in the kingdom Protista in Whitaker's system. The term protista was coined by Ernst Haeckel. This kingdom forms a link between the kingdom Monera on one hand and the other three kingdoms. Protestants are ancestors of all multicellular eukaryotes.
Option C: Algae, Bryophytes, Pteridophytes, Gymnosperms, and Angiosperms come under the Plantae kingdom. The bryophytes are divided into liverworts and mosses. Angiosperms are flowering plants.
Option D: Arthropods and Mammals come under the Animalia kingdom. Arthropods include insects. Mammalia includes humans.
So the correct answer is (A).
Additional Information:

Prokaryotic cell	Eukaryotic cell
The cell size is usually small.	The cell size is comparatively larger.
The nucleolus is absent.	The nucleolus is present.
Ribosomes are 70S type.	Ribosomes are of 80S type: 70S type ribosome occurs in mitochondria and plastids.
Membrane-bound organelles are absent.	Membrane-bound organelles are present.

Note: Viruses are infectious agents, with simple, acellular organisation. They are expecting the cell theory. The study of viruses is called virology. Viruses are neither prokaryotic nor eukaryotic.