Biological Classification — NEET UG practice

123 questions

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Sample questions with solutions

Q1 · 2026

Which of the following is not a prokaryote?

  • A.

    Fungi

  • B.

    Bacteria

  • C.

    Blue green algae

  • D.

    Mycoplasma

Answer: A
  1. Recall that prokaryotic cells lack a true, membrane-bound nucleus, and this group includes bacteria, blue-green algae (cyanobacteria), and Mycoplasma.
Prokaryotes={Bacteria, Blue-green algae, Mycoplasma}\text{Prokaryotes} = \{\text{Bacteria, Blue-green algae, Mycoplasma}\}
  1. Recall that fungi are eukaryotic organisms, meaning their cells possess a well-defined, membrane-bound nucleus and other membrane-bound organelles.

Hence, since Fungi is the only eukaryotic organism among the options, the correct answer is Option A, Fungi.

Q2 · 2026

The main criteria used for Five Kingdom Classification proposed By R.H. Whittaker (1969) included :

A. Cell structure B. Body organization C. Presence of flagellum D. Reproduction E. Phylogenetic relationships

Choose the correct answer from the options given below :

  • A.

    A, B, C, D and E

  • B.

    B, C and D only

  • C.

    A, B, D and E only

  • D.

    A, B and E only

Answer: C
  1. Recall the criteria that R.H. Whittaker (1969) used while proposing the Five Kingdom system of classification.
Criteria={Cell structure, Body organization, Mode of nutrition, Reproduction, Phylogenetic relationships}\text{Criteria} = \{\text{Cell structure, Body organization, Mode of nutrition, Reproduction, Phylogenetic relationships}\}

  1. Check each listed option against this set: Cell structure (A), Body organization (B), and Reproduction (D) and Phylogenetic relationships (E) are all valid Whittaker criteria.

  2. Since presence of flagellum (C) is not one of the five main criteria used by Whittaker, it must be excluded.

Hence, the correct set is A, B, D and E only, i.e., Option C.

Q3 · 2026

Mad cow disease is caused by ____

  • A.

    Mycoplasma sp.

  • B.

    prions

  • C.

    viroids

  • D.

    Aspergillus sp.

Answer: B
  1. Recall that prions are infectious, abnormally folded proteins that lack any nucleic acid, unlike viruses or viroids.
Prion (misfolded protein)→induces normal proteins to misfold\text{Prion (misfolded protein)} \rightarrow \text{induces normal proteins to misfold}
  1. Since Mad Cow Disease (Bovine Spongiform Encephalopathy) is a neurodegenerative disease caused by such misfolded proteins accumulating in brain tissue, it fits the definition of a prion disease.

Hence, the correct answer is Option B, prions.

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