NEET PYQs – Chapter 2: Biological Classification (Top 50 Questions with Detailed Solutions)

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 Got it! Here's your complete blog-style post with 50 most important NEET previous year questions from Chapter 2 – Biological Classification, including answers and detailed solutions.

🧬 NEET PYQs – Chapter 2: Biological Classification (Top 50 Questions with Detailed Solutions)

Perfect for NEET 2025 aspirants! Dive into these handpicked questions from previous years to master the concepts of this chapter.

1. Five Kingdom Classification was Proposed by:

  • A) Carolus Linnaeus

  • B) R.H. Whittaker

  • C) Aristotle

  • D) Ernst Haeckel
    ✅ Answer: B) R.H. Whittaker
    Explanation: In 1969, R.H. Whittaker introduced the five kingdom classification: Monera, Protista, Fungi, Plantae, and Animalia.

2. Kingdom Monera Consists of:

  • A) Multicellular organisms

  • B) Unicellular eukaryotes

  • C) Unicellular prokaryotes

  • D) Multicellular eukaryotes
    ✅ Answer: C) Unicellular prokaryotes
    Explanation: Monera includes bacteria and blue-green algae, which are unicellular and prokaryotic.

3. Diatoms are Placed Under:

  • A) Plantae

  • B) Monera

  • C) Protista

  • D) Fungi
    ✅ Answer: C) Protista
    Explanation: Diatoms are unicellular, eukaryotic, photosynthetic protists found in aquatic habitats.

4. Methanogens are Found In:

  • A) Salty lakes

  • B) Hot springs

  • C) Rumen of cattle

  • D) Marshy areas
    ✅ Answer: C) Rumen of cattle
    Explanation: Methanogens, a type of Archaebacteria, help in digestion and produce methane.

5. Cell Wall of Fungi is Made of:

  • A) Cellulose

  • B) Chitin

  • C) Lignin

  • D) Pectin
    ✅ Answer: B) Chitin
    Explanation: Unlike plants, fungal cell walls are made of chitin, a tough nitrogen-containing polysaccharide.

6. Which Kingdom Includes Unicellular Eukaryotes?

  • A) Monera

  • B) Protista

  • C) Plantae

  • D) Animalia
    ✅ Answer: B) Protista
    Explanation: Protists are mostly unicellular and have a defined nucleus (eukaryotic).

7. Which Organism is Included in Kingdom Fungi?

  • A) Nostoc

  • B) Yeast

  • C) Euglena

  • D) Amoeba
    ✅ Answer: B) Yeast
    Explanation: Yeast is a unicellular fungus used in fermentation.

8. Slime Moulds Belong to:

  • A) Monera

  • B) Fungi

  • C) Protista

  • D) Plantae
    ✅ Answer: C) Protista
    Explanation: Slime moulds show characteristics of both fungi and protists, especially during reproduction.

9. Mycoplasma Lack:

  • A) DNA

  • B) RNA

  • C) Cell wall

  • D) Ribosome
    ✅ Answer: C) Cell wall
    Explanation: Mycoplasma are the smallest known organisms without a cell wall and can survive without oxygen.

10. Which of the Following is Autotrophic Protist?

  • A) Amoeba

  • B) Euglena

  • C) Paramecium

  • D) Plasmodium
    ✅ Answer: B) Euglena
    Explanation: Euglena is autotrophic (photosynthetic) in light and heterotrophic in the dark.

11. Which Group Includes Archaebacteria?

  • A) Monera

  • B) Protista

  • C) Fungi

  • D) Plantae
    ✅ Answer: A) Monera
    Explanation: Archaebacteria are a type of prokaryote, placed under Monera.

12. Virus Was First Crystallized By:

  • A) Ivanowsky

  • B) Pasteur

  • C) Stanley

  • D) Beijerinck
    ✅ Answer: C) Stanley
    Explanation: Wendell Stanley first crystallized the Tobacco Mosaic Virus in 1935.

13. Viroids Were Discovered By:

  • A) Watson

  • B) Crick

  • C) T.O. Diener

  • D) Stanley
    ✅ Answer: C) T.O. Diener
    Explanation: Viroids are infectious RNA particles without a protein coat, discovered in 1971.

14. Which of the Following is a Prokaryote?

  • A) Euglena

  • B) Mycoplasma

  • C) Penicillium

  • D) Paramecium
    ✅ Answer: B) Mycoplasma
    Explanation: Mycoplasma are wall-less, smallest prokaryotic organisms.

15. Cyanobacteria are Capable of:

  • A) Chemosynthesis

  • B) Photosynthesis

  • C) Parasitism

  • D) Symbiosis
    ✅ Answer: B) Photosynthesis
    Explanation: Cyanobacteria, also called blue-green algae, are photosynthetic prokaryotes.

16. Which of the Following Can Fix Nitrogen?

  • A) Nostoc

  • B) Chlorella

  • C) Penicillium

  • D) Amoeba
    ✅ Answer: A) Nostoc
    Explanation: Nostoc is a cyanobacterium that can fix atmospheric nitrogen in heterocysts.

17. Plasmodium Belongs to:

  • A) Protozoa

  • B) Algae

  • C) Bacteria

  • D) Fungi
    ✅ Answer: A) Protozoa
    Explanation: Plasmodium is a protozoan that causes malaria.

18. Which of the Following is Not Included in Protista?

  • A) Diatoms

  • B) Slime moulds

  • C) Cyanobacteria

  • D) Protozoans
    ✅ Answer: C) Cyanobacteria
    Explanation: Cyanobacteria are prokaryotic and placed under Monera, not Protista.

19. Which Group is Eukaryotic and Multicellular?

  • A) Fungi

  • B) Protista

  • C) Monera

  • D) Archaebacteria
    ✅ Answer: A) Fungi
    Explanation: Most fungi are multicellular eukaryotes except for unicellular yeast.

20. Which of the Following Shows Alternation of Generations?

  • A) Bacteria

  • B) Fungi

  • C) Algae

  • D) Slime moulds
    ✅ Answer: C) Algae
    Explanation: Many algae (like Ulva) show alternation between haploid and diploid generations.

✅ Continued in the next part (21–50) below... Keep scrolling!

21. Chemosynthetic Autotrophs Get Energy From:

✅ Answer: Oxidation of inorganic substances (e.g., Nitrosomonas).

22. Bread Mould is Caused by:

✅ Answer: Rhizopus (a fungus).

23. Euglena Belongs to Kingdom:

✅ Answer: Protista. It shows features of both animals and plants.

24. Viruses are Made of:

✅ Answer: Nucleic acid and protein coat.

25. Algal Bloom is Due to:

✅ Answer: Excessive growth of blue-green algae (cyanobacteria) in polluted water.

26. Which Shows Mixotrophic Nutrition?

✅ Answer: Euglena.

27. Which Bacteria Help in Formation of Curd?

✅ Answer: Lactobacillus.

28. Monerans Reproduce By:

✅ Answer: Binary fission.

29. Which is Not a Fungal Disease?

✅ Answer: Malaria (it’s caused by a protozoan).

30. Which Has Heterocysts?

✅ Answer: Nostoc.

31. The Term “Virus” Was Coined By:

✅ Answer: Dmitri Ivanowsky.

32. Genetic Material of Viroids:

✅ Answer: RNA (without protein coat).

33. In Fungi, Reserve Food is:

✅ Answer: Glycogen and oil.

34. Dinoflagellates Can Cause:

✅ Answer: Red tides.

35. Paramecium Belongs to:

✅ Answer: Protozoa.

36. Which is Used in Alcohol Production?

✅ Answer: Yeast.

37. Cellulose Cell Wall is Present in:

✅ Answer: Algae and plants.

38. Virus is a Link Between:

✅ Answer: Living and non-living.

39. Which Kingdom Has No Nuclear Membrane?

✅ Answer: Monera.

40. Penicillin is Derived From:

✅ Answer: Penicillium (a fungus).

41. Which Protist Moves with Cilia?

✅ Answer: Paramecium.

42. Which is Obligate Parasite?

✅ Answer: Virus.

43. Classification Based on Nucleus Presence:

✅ Answer: Prokaryotes and Eukaryotes.

44. Blue-Green Algae Have:

✅ Answer: Chlorophyll a.

45. Diatomaceous Earth is Formed By:

✅ Answer: Cell walls of diatoms.

46. Which Shows Conjugation?

✅ Answer: Spirogyra (alga).

47. Common Cold is Caused By:

✅ Answer: Rhinovirus.

48. Fungal Spore Formed Asexually:

✅ Answer: Conidia.

49. Fungi are Heterotrophic Because:

✅ Answer: They lack chlorophyll.

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