Question

Karyotaxonomy is the modern branch of classification which is based on
A. Number of chromosomes
B. Bands found on chromosomes
C. Organic evolution
D. Trinomial nomenclature

Answer 1

Taxonomy is a branch of science that deals in classification and naming of living organisms so that they could be studied easily. The classification is necessary to know the evolution of all living organisms. The taxonomy helps us to understand similarities and dissimilarities between living organisms.

Complete answer:
Karyotaxonomy is the classification of living organisms based on the structure and the number of chromosomes. Size of chromosomes, structure of chromosomes, shape of chromosomes and chromosome number are kept in mind during classification. Karyotaxonomy is a type of taxonomy and other types of taxonomy are morphotaxonomy, cytotaxonomy and chemotaxonomy.
Morphotaxonomy is classification of organisms according to their morphology and dependent on shape and structure of an organism.
Cytotaxonomy is classification of organisms on the basis of their cellular structure. Cytochrome C is the major basis of classification.
Chemotaxonomy is classification of an organism on the basis of biochemicals which are present in the cell. This classification is mainly based on proteins present in the cells.

Hence, the correct option is A. Number of chromosomes.

Note:
Trinomial nomenclature is classification of an organism based on the name of an organism in three parts. The name in trinomial nomenclature refers to taxa below the rank of species. Organic evolution is a theory that states that recent types of plants and animals have their origin from pre existing animals and plants. Bands on chromosomes refer to light and dark regions along the chromosomes. These bands are distinguished with each other because of light and dark color on the chromosome.