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Question

Which one among the following is the correct scheme followed for classification of animals ?

This question was previously asked in
CDS 2 2025 Maths Question Paper (14-Sep-2025)
The correct answer is
Phylum \(\rightarrow\) Class \(\rightarrow\) Order \(\rightarrow\) Family \(\rightarrow\) Genus \(\rightarrow\) Species

Understanding Animal Classification

Classification in biology is the process of arranging organisms into groups based on similarities and evolutionary relationships. This system helps scientists organize the vast diversity of life on Earth. The hierarchical structure used is known as taxonomic ranks.

The Correct Classification Scheme

The standard taxonomic hierarchy, moving from the broadest category to the most specific, includes several levels. When classifying animals, the correct sequence among the options provided follows this established biological order:

  • Phylum: A major category in the classification of animals, ranking below Kingdom. Examples include Chordata (animals with a backbone) or Arthropoda (insects, spiders, crustaceans).
  • Class: A rank below Phylum. Examples include Mammalia (mammals), Aves (birds), Reptilia (reptiles).
  • Order: A rank below Class. Examples include Primates (monkeys, apes, humans), Carnivora (dogs, cats, bears).
  • Family: A rank below Order. Examples include Hominidae (great apes and humans), Felidae (cats).
  • Genus: A rank below Family, typically consisting of closely related species. Example: Homo (humans).
  • Species: The most specific rank, representing a group of organisms that can interbreed and produce fertile offspring. Example: sapiens (humans).

Therefore, the correct scheme followed for the classification of animals is:

Phylum \(\rightarrow\) Class \(\rightarrow\) Order \(\rightarrow\) Family \(\rightarrow\) Genus \(\rightarrow\) Species

Analysis of Incorrect Options

The other options presented incorrect sequences of these taxonomic ranks. For instance:

  • Option 1 incorrectly places Class before Phylum and mixes up the order of subsequent ranks.
  • Option 2 places Family before Genus and Order, which is incorrect.
  • Option 3 presents a significantly jumbled order, starting with Order and placing Phylum much later.

Memorizing the correct hierarchy is crucial for understanding biological relatedness and the Linnaean system of taxonomy.

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Important Questions from Biological Classification

  1. Select the hierarchy (descending) of the taxonomic ranks using the codes given below:

    A. Order

    B. Genus

    C. Class

    D. Species

    E. Family

    Codes :

  2. Mycoplasmas are different from the other prokaryotes by:

  3. Osmoregulation in Amoeba takes place by

  4. Taxonomic studies based on DNA are part of:

  5. Mycology is related to the study of-

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