Question

Biosystematics aims at
A)The classification of organisms based on broad morphological characters.
B)Delimiting various taxa of organisms and establishing their relationships.
C)The classification of organisms based in their evolutionary history and establishing their phylogeny on totality of various parameters from all fields of studies.
D)Identification and arrangement of organisms on the basis of their cytological characteristics.

Answer 1

Biological systematics or biosystematics is the study of the diversity of living organisms, both in past and in present and their relationships through time. Relationships are referred to as evolutionary trees. Biosystematics is taxonomy based on cytogenetics and genetics. It is concerned with cytological, genetical, ecological aspects of taxonomy.

Complete answer:
Option A- The classification of organisms based on broad morphological characters.
The artificial system of classification is based on morphological characters. It includes the non-evolutionary features of the organisms.
Option B- Delimiting various taxa of organisms and establishing their relationships.
Taxometric methods are used for delimiting various taxa of organisms. This includes two phases-
i)Collecting all the intrinsic phenotypic evidence and extrinsic ecological evidence.
ii)Preparing cytogenetic and related investigations.
Option C- The classification of organisms based in their evolutionary history and establishing their phylogeny on totality of various parameters from all fields of studies.
This classification is referred to as Systematics. Phylogeny is referred to as the evolution of genetically related organisms.
Option D- Identification and arrangement of organisms on the basis of their cytological characteristics.
It is included in cytotaxonomy which is the classification of organisms by study of chromosomes during meiosis. It includes the number, behaviour and structure of chromosomes.
Thus, the correct option is Option C- The classification of organisms based in their evolutionary history and establishing their phylogeny on totality of various parameters from all fields of studies.

Hence the correct answer is OPTION(C)

Note: Taxa is a unit of biological classification. It is a group of one or more related organisms. There are eight taxa or levels of classification into which organisms are divided. These are domain, kingdom, phylum, class, order, family, genus, and species. The highest level of taxa is domain. Cytogenetics is done for studying the pathological function and structure of chromosomes.