Question

A group of closely related, structurally and functionally similar organism which interbreed with one another in nature, but not with organisms of the other groups is known as
A) Order
B) Genus
C) Species
D) Family

Answer 1

One of these groups should be able to differentiate the other closely related group on the basis of their different morphology.

Complete answer:
Categorization or classification does not involve a single step but a hierarchy of steps in which each step reflects one grade or category. As the group belongs to the general taxonomic arrangement, it is classified as the taxonomic and the taxonomic hierarchy for all groups. In fact, each category, called a classification unit, is a rank and is usually called taxon. Taxonomic studies have resulted in common categories such as kingdom, phylum or division (for plants), class, order, family, genus and species. The lowest category is species in all life, both in the plant and animal kingdoms.

Order and other higher taxonomic groups are typically classified according to character aggregates. Order is the assembly of families with a few identical characters, as a higher category. Compared with different genera within a family, identical characters are less numerous.
The genus consists of a number of similar species with more characteristics than other genera. We may assume that genera are close-knit aggregates.

A group of individual organisms with basic similarities are considered as a species by taxonomic studies. One of these species should be able to differentiate the other closely related species on the basis of their different morphology. Species is a group of closely related, structurally and functionally similar organism which interbreed with one another in nature, but not with organisms of the other groups
Family, the next type, has a group of genera with far less similarity than genus and species. Families are distinguished both by their vegetative and by their reproductive characteristics.

Thus, the correct answer is option ‘C’. i.e., Species.

Note: Taxonomic studies have resulted in common categories such as kingdom, phylum or division (for plants), class, order, family, genus and species. The lowest category is species in all life, both in the plant and animal kingdoms.