Are these the official NEET questions on Biological Classification?

Yes. They are the questions NTA set in each paper, in its wording. The solutions are written by BrainIt.

Biological Classification NEET PYQs with Solutions (2020 to 2026) PDF

The questions come from NEET 2026, Re-NEET 2026 and NEET 2020. Each shows its answer and solution when you open it, so you can attempt it first. For what the chapter covers and how NEET tests it, see the Biological Classification guide.

Practise on the CBT screen8 questions, 8 minutes, marked +4 / −1 Download PDF4 pages, 0.8 MB, with answers and solutions

NEET 2026 · the full paper

NEET 2026 · Q132
The main criteria used for Five Kingdom Classification proposed By R.H. Whittaker (1969) included.

Statement I: Cell structure
Statement II: Body organization
Statement III: Presence of flagellum
Statement IV: Reproduction
Statement V: Phylogenetic relationships

Choose the correct answer from the options given below:
1. (1)
  I, II, III, IV and V
2. (2)
  II, III and IV only
3. (3)
  I, II, IV and V only
4. (4)
  I, II and V only
Answer and solution
Answer: (3)
Whittaker's five kingdom classification was based on cell structure (Statement I), body organisation (Statement II), mode of nutrition, reproduction (Statement IV) and phylogenetic relationships (Statement V). Presence of a flagellum (Statement III) was not one of the main criteria, so the correct set is I, II, IV and V.
NEET 2026 · Q179
The flightless bird with forelimbs modified as paddle-like structures suited for swimming is known as:
1. (1)
  Struthio
2. (2)
  Neophron
3. (3)
  Aptenodytes
4. (4)
  Psittacula
Answer and solution
Answer: (3)
Aptenodytes is the genus of penguins, flightless birds whose forelimbs are modified into paddle-like flippers used for swimming.
Struthio (ostrich) is flightless but its reduced wings are used for balance while running, not swimming, while Neophron (vulture) and Psittacula (parakeet) are flying birds.
Hence Aptenodytes.

Re-NEET 2026 · the full paper

Re-NEET 2026 · Q92
Symbiotic association between fungi and algae are called ________.
1. (1)
  lichens
2. (2)
  sponges
3. (3)
  mycorrhiza
4. (4)
  chrysophytes
Answer and solution
Answer: (1)
In a lichen the algal partner (the phycobiont) photosynthesises and supplies food, while the fungal partner (the mycobiont) provides shelter, anchorage and absorbs mineral nutrients and water. Lichens are highly sensitive to pollution, which is why they are used as air-quality indicators. NCERT Class 11, Biological Classification.
Re-NEET 2026 · Q101
Mad cow disease is caused by _______.
1. (1)
  prions
2. (2)
  viroids
3. (3)
  Aspergillus sp.
4. (4)
  Mycoplasma sp.
Answer and solution
Answer: (1)
Prions are abnormally folded PROTEIN particles with no nucleic acid at all. They act as templates that force the normal cellular protein into the same misfolded shape, producing spongiform degeneration of the brain. Bovine spongiform encephalopathy in cattle and its human counterpart, Creutzfeldt-Jakob disease, are both prion diseases. NCERT Class 11, Biological Classification.
Re-NEET 2026 · Q112
Match List-I with List-II.
List I
List II
P) Spherical
I) Vibrio
Q) Rod
II) Cocci
R) Comma
III) Spirilla
S) Spirillum
IV) Bacilli
Choose the correct answer from the options given below :
1. (1)
  P-I, Q-III, R-II, S-IV
2. (2)
  P-III, Q-II, R-I, S-IV
3. (3)
  P-II, Q-I, R-IV, S-III
4. (4)
  P-II, Q-IV, R-I, S-III
Answer and solution
Answer: (4)
Bacteria are classified by shape into four basic forms: spherical cocci (P-II), rod-shaped bacilli (Q-IV), comma-shaped vibrio (R-I) and spiral spirilla (S-III). The names are worth learning together because each is simply the Latin word for the shape. NCERT Class 11, Biological Classification.
Re-NEET 2026 · Q126
Which of the following is not a prokaryote?
1. (1)
  Bacteria
2. (2)
  Blue green algae
3. (3)
  Mycoplasma
4. (4)
  Fungi
Answer and solution
Answer: (4)
Fungi belong to Kingdom Fungi and are EUKARYOTES - they possess a true membrane-bound nucleus, mitochondria and other organelles. The other three are all prokaryotic members of Kingdom Monera: bacteria, cyanobacteria (blue-green algae) and the wall-less Mycoplasma. NCERT Class 11, Biological Classification.
Re-NEET 2026 · Q129
Match List-I with List-II.
List I
List II
P) Fusion of protoplasms between gametes
I) Meiosis
Q) Fusion of two nuclei
II) Plasmogamy
R) Generation of haploid spores
III) Karyogamy
Choose the correct answer from the options given below :
1. (1)
  P-II, Q-III, R-I
2. (2)
  P-II, Q-I, R-III
3. (3)
  P-III, Q-II, R-I
4. (4)
  P-I, Q-III, R-II
Answer and solution
Answer: (1)
Sexual reproduction in fungi runs through three named steps in sequence. Plasmogamy is the fusion of the two protoplasts (P-II), karyogamy is the subsequent fusion of the two nuclei (Q-III), and meiosis in the resulting diploid zygote restores the haploid condition and generates spores (R-I). In many fungi plasmogamy and karyogamy are separated by a long dikaryotic phase, which is why they are named as distinct events. NCERT Class 11, Biological Classification.

List I	List II
P) Spherical	I) Vibrio
Q) Rod	II) Cocci
R) Comma	III) Spirilla
S) Spirillum	IV) Bacilli

List I	List II
P) Fusion of protoplasms between gametes	I) Meiosis
Q) Fusion of two nuclei	II) Plasmogamy
R) Generation of haploid spores	III) Karyogamy

NEET 2020 · the full paper

NEET 2020 · Q19
Which of the following is correct about viroids?
1. (1)
  They have free RNA without protein coat
2. (2)
  They have DNA with protein coat
3. (3)
  They have free DNA without protein coat
4. (4)
  They have RNA with protein coat
Answer and solution
Answer: (1)
Viroids are infectious agents composed of short strands of naked RNA without a protein coat. Chapter: Biological Classification.

Practise Biological Classification in the app: it brings back the questions you get wrong, so the chapter improves, not just your memory of these. Or try the free CBT mock. All chapters: NEET chapter-wise PYQs.

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Biological Classification: NEET previous year questions

NEET 2026 · the full paper

Re-NEET 2026 · the full paper

NEET 2020 · the full paper

Questions