Question

The third name in trinomial nomenclature is
A) Species
B) Subgenus
C) Subspecies
D) Ecotype

Answer 1

Scientific names are the standard names that are given to organisms to identify them and each scientific name is specific only to one organism. Scientific names are given on the basis that from where the organism originates and also according to the characteristics features of organisms.

Complete answer:
All biologists are currently using internationally agreed and accepted codes of rules or principles while assigning scientific names to known or newly discovered organisms. Binomial nomenclature for scientific naming of organisms was developed by Carolus Linnaeus. Each name is composed of two parts, i.e., the first part comprises its generic name, while the second part is the specific epithet.

Advantages of binomial nomenclature
i) This system provides different and proper scientific names to a variety of organisms.
ii) This naming system which makes use of two-word format is universally accepted and used, as it is more convenient and easier to understand and follow.
iii) In a binomial nomenclature, every living organism has a distinct and a unique scientific name. This helps in their easy identification and classification.
iv) Then comes another nomenclature system that is trinomial nomenclature that was proposed by Lamarck.

Now let us find solution from given options :
A) Species : This is defined as the basic unit of classification. It was used in binomial nomenclature as a second word and also in trinomial nomenclature as a second word.
B) Subgenus : the category below genus is defined as sub genus. It is not involved in any of the classification systems.
C) Subspecies : The trinomial nomenclature uses three words and third name quotes for subspecies in animals and varieties in plants. As for example Indian crow was named Corvus splendens
D) Ecotype : It is a different kind of animal species or plants that occupy a particular habitat.

Hence the correct answer is option ‘C’ i.e, subspecies.

Note: Principle of priority is the most important of all the rules of ICBN. If the first name given to the organism is valid in terms of rules), that will be considered at the first preference. Any other valid name given after that will be considered as a synonym. No names are recognized prior to those used by Linnaeus in 1758 in the 10th edition of Systema Naturae for animals and 1753 for plants.