NEET Biological Classification PYQs & Practice Questions

10 free NEET Biology questions on Biological Classification, starting with previous year questions (2016–2026). Tap “Show answer” to check each one. No login needed.

Topics: Kingdom Protista · Five Kingdom Classification · Archaebacteria · Kingdom Fungi - Slime Molds · Dikaryotic Stage in Fungi · Discovery of Viruses · Viruses vs Viroids · Sexual Cycle in Fungi · Taxonomic Position of Viruses · Nitrogen Fixation by Microorganisms · Whittaker's Five Kingdom Classification · Taxonomic Hierarchy

1. Q1NEET 2026Shapes of Bacteria - Matching

   Match List-I with List-II. List-I: A. Spherical, B. Rod, C. Comma, D. Spirillum List-II: I. Vibrio, II. Cocci, III. Spirilla, IV. Bacilli Choose the correct answer from the options given below:

   • A. A-III, B-II, C-I, D-IV
   • B. A-II, B-I, C-IV, D-III
   • C. A-II, B-IV, C-I, D-III
   • D. A-I, B-III, C-II, D-IV
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   Answer: B — A-II, B-I, C-IV, D-III

   Spherical-shaped bacteria are called Cocci (II). Rod-shaped bacteria are called Bacilli (IV). Comma-shaped bacteria are called Vibrio (I). Spirillum-shaped (spiral) bacteria are called Spirilla (III). So A-II, B-IV, C-I, D-III.

2. Q2NEET 2026Characteristics of Prokaryotic Cells

   Which of the following are characteristics of prokaryotic cells? (a) Ribosomes are made of 50S and 30S subunits (b) They can have plasmids (c) They contain mesosome (d) They have peroxisomes Choose the correct answer from the options given below:

   • A. (a) and (c) only
   • B. (a), (c) and (d) only
   • C. (a), (b) and (c) only
   • D. (b) and (c) only
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   Answer: B — (a), (c) and (d) only

   Prokaryotic ribosomes are 70S, composed of 50S and 30S subunits -- (a) correct. Prokaryotes can carry extrachromosomal circular DNA called plasmids -- (b) correct. Prokaryotic cell membranes can form infoldings called mesosomes -- (c) correct. Peroxisomes are membrane-bound organelles found in eukaryotic cells, not prokaryotes -- (d) is incorrect. So (a), (b) and (c) only.

3. Q3NEET 2026Symbiotic Associations - Lichens

   Symbiotic association between fungi and algae are called

   • A. Sponges
   • B. Mycorrhiza
   • C. Chrysophytes
   • D. Lichens
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   Answer: C — Chrysophytes

   Lichens are symbiotic associations between a fungal partner (mycobiont) and an algal or cyanobacterial partner (photobiont). (Mycorrhiza, in contrast, is a symbiotic association between fungi and plant roots.)

4. Q4NEET 2026Prokaryotes vs Eukaryotes

   Which of the following is not a prokaryote?

   • A. Blue green algae
   • B. Mycoplasma
   • C. Fungi
   • D. Bacteria
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   Answer: B — Mycoplasma

   Fungi are eukaryotic organisms (they have a membrane-bound nucleus and organelles). Blue green algae (cyanobacteria), Mycoplasma, and Bacteria are all prokaryotes.

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5. Q5NEET 2026Prions and Mad Cow Disease

   Mad cow disease is caused by_________.

   • A. Viroids
   • B. Aspergillus sp.
   • C. Mycoplasma sp.
   • D. Prions
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   Answer: C — Mycoplasma sp.

   Mad cow disease (Bovine Spongiform Encephalopathy) is caused by prions, which are infectious misfolded proteins.

6. Q6NEET 2025Nitrogen Fixation by Microorganisms

   Which of following organisms cannot fix nitrogen? A. Azotobacter, B. Oscillatoria, C. Anabaena, D. Volvox, E. Nostoc. Choose the correct answer from the options given below:

   • A. A only
   • B. D only
   • C. B only
   • D. E only
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   Answer: A — A only

   Azotobacter (bacterium), Oscillatoria, Anabaena, and Nostoc (cyanobacteria) are all nitrogen-fixing organisms. Volvox is a green alga that does not fix nitrogen.

7. Q7NEET 2025Whittaker's Five Kingdom Classification

   Each of the following characteristics represent a Kingdom proposed by Whittaker. Arrange the following in increasing order of complexity of body organization. (A) Multicellular heterotrophs with cell wall made of chitin. (B) Heterotrophs with tissue/organ/organ system level of body organization. (C) Prokaryotes with cell wall made of polysaccharides and amino acids. (D) Eukaryotic autotrophs with tissue/organ level of body organization. (E) Eukaryotes with cellular body organization. Choose the correct answer from the options given below:

   • A. A, C, E, B, D
   • B. C, E, A, D, B
   • C. A, C, E, D, B
   • D. C, E, A, B, D
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   Answer: A — A, C, E, B, D

   Increasing complexity: Monera (C, prokaryotes) → Protista (E, eukaryotes with cellular organization) → Fungi (A, multicellular heterotrophs, chitin cell wall) → Plantae (D, eukaryotic autotrophs, tissue/organ level) → Animalia (B, heterotrophs, tissue/organ/organ-system level). So C, E, A, D, B.

8. Q8NEET 2022Taxonomic Hierarchy Ascending Order

   In the taxonomic categories which hierarchial arrangement in ascending order is correct in case of animals?

   • A. Kingdom, Class, Phylum, Family, Order, Genus, Species
   • B. Kingdom, Order, Class, Phylum, Family, Genus, Species
   • C. Kingdom, Order, Phylum, Class, Family, Genus, Species
   • D. Kingdom, Phylum, Class, Order, Family, Genus, Species
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   Answer: C — Kingdom, Order, Phylum, Class, Family, Genus, Species

   The correct ascending order (broadest to narrowest) of taxonomic categories is Kingdom, Phylum, Class, Order, Family, Genus, Species. (NCERT Class 11, Pg 10)

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9. Q9NEET 2022Algae - Economic Importance

   Hydrocolloid carrageen is obtained from:

   • A. Chlorophyceae and Phaeophyceae
   • B. Phaeophyceae and Rhodophyceae
   • C. Rhodophyceae only
   • D. Phaeophyceae only
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   Answer: B — Phaeophyceae and Rhodophyceae

   Carrageenan (carrageen) is a hydrocolloid extracted specifically from red algae (Rhodophyceae), such as Chondrus and Gigartina species.

10. Q10NEET 2022Algae - Pigments and Storage Products

    Which of the following is incorrectly matched?

    • A. Ectocarpus - Fucoxanthin
    • B. Ulothrix - Mannitol
    • C. Porphyra - Floridean Starch
    • D. Volvox - Starch
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    Answer: A — Ectocarpus - Fucoxanthin

    Ulothrix is a green alga (Chlorophyceae) that stores starch as its reserve food material, not mannitol. Mannitol is a storage product of brown algae (Phaeophyceae) like Laminaria, not Ulothrix, making this match incorrect.