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Biological Classification — NEET Biology MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

Who proposed the five-kingdom classification used in this chapter?
  1. R.H. Whittaker ✓
  2. Carolus Linnaeus
  3. Aristotle
  4. Ernst Mayr
Answer: A. R.H. Whittaker proposed the five-kingdom classification in 1969. Linnaeus is the closest historical trap because his name is tied to the earlier two-kingdom system.
Why not B: Linnaeus is associated here with the two-kingdom system.
Why not C: Aristotle used simple morphology in an early classification.
Why not D: Mayr is highlighted for species and evolutionary biology, not this scheme.
Why was the two-kingdom system inadequate?
  1. It separated fungi from green plants despite identical nutrition.
  2. It distinguished prokaryotes from eukaryotes too sharply.
  3. It grouped unlike organisms without separating cell type, organisation and nutrition. ✓
  4. It created separate kingdoms for every unicellular organism.
Answer: C. The two-kingdom system combined prokaryotes with eukaryotes, unicellular with multicellular forms, and fungi with photosynthetic plants. The first option is tempting because fungi were involved, but the defect was failure to separate them.
Why not A: Fungi and green plants differ in nutrition and wall composition and were wrongly combined.
Why not B: The system failed to make this distinction.
Why not D: It had only Plantae and Animalia, not many unicellular kingdoms.
Assertion (A): Mycoplasma can survive without oxygen. Reason (R): Mycoplasma completely lacks a cell wall.
  1. Both A and R are true, but R is not the correct explanation of A. ✓
  2. Both A and R are true, and R is the correct explanation of A.
  3. A is true, but R is false.
  4. A is false, but R is true.
Answer: A. Both traits are stated for Mycoplasma, but wall absence does not explain anaerobic survival. Option B is tempting because adjacent facts are often incorrectly treated as cause and effect.
Why not B: Wall absence and anaerobic survival are both traits, but NCERT does not make the former the cause of the latter.
Why not C: This rejects the explicit absence of a cell wall.
Why not D: This accepts wall absence but rejects the stated ability to survive without oxygen.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Biological Classification →

Other NEET Biology chapters

The Living WorldPlant KingdomAnimal KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsStructural Organisation in Animals

All 32 chapters →

Questions

How many NEET questions are there on Biological Classification?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Biology chapter test free?

Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.