Hierarchy of classification - class-IX

Each category is referred to as a unit of classification or rank and is commonly called taxon. A taxon is a general term for grouping in a systematic classification. A taxon refers to a group of similar and genetically related individuals having certain characters different from other groups.
Correct answer is option B.

In biological classification, the taxonomic rank genus is the relative level of a group of genus-group names and species-group names. Therefore, the genus is interpolated between family and species.

The Kangaroo and Monkey...Belong To the Kingdom animalia..of Phylum Chordata.-class mammals of sub class Metatheria(kangaroo) and sub class eutheria (monkey).
Correct answer is option A.

Correct answer is B.
As we go higher form species to kingdom, number of common characteristics goes on decreasing.

B is the right answer.
Musca domestica --- is Housefly. Phylum Arthropoda.

Linnaeus published his work on plant classification, specifically the sexual system of classification, in 'Species Plantarum' in 1753.

Pomato is a somatic hybrid produced by the fusion of protoplasts of potato and tomato, which is a technique of somatic hybridization.

Agave and Yucca were moved to Agavaceae primarily due to their anatomical similarities, specifically in their vascular structure and leaf morphology.

A mule is the sterile offspring of a male donkey and a female horse. It is not a separate species because it cannot reproduce with other mules to maintain a population.

• According to the taxonomical hierarchy, the kingdom is the highest category in biological classification. It is a group of closely related organisms. 
  
• Kingdom → Phylum → Class → Order → Family → Genus → Species.
  
• Example: All plants have common features of the autotrophic mode of nutrition and the presence of a cell wall made up of cellulose. Hence, they belong to the kingdom Plantae.
  

In 1860s, the German investigator Ernst Haeckel proposed a three-kingdom system of classification. Haeckel's three kingdoms were Animalia, Plantae, and Protista. 

In Vedic times, the ;living organisms were divided into the following:

In the year 1866, Ernst Haeckel proposed the three kingdom classification. The three kingdoms are protista, plantae and animalia. The unicellular prokaryotic organisms were placed in the group of monera. This group includes the organisms which have chloroplast and resemble plants as well as the organisms which resemble animals. The group of protists are divided into two groups as plant-like protists and animal-like protists. 

Linnaeus's system was artificial because it relied on a few easily observable morphological characters, such as the number of stamens, rather than evolutionary or phylogenetic relationships.