Blood Composition And Types: Previous Year Questions with Solutions
Previous year questions are the single most reliable guide for NEET and board prep. Roughly 25–30% of every NEET paper repeats concepts (and sometimes exact questions) from older papers. We’ve picked five PYQs on ABO and Rh blood groups, agglutinogens, agglutinins, and universal donors/recipients and solved them the way we’d solve them in the hall — timed, structured, and without guessing.
PYQ 1 — NEET 2019 Style
Question. Which of the following statements about antigen A is correct?
a) It is found only in eukaryotes. b) It is the defining feature of prokaryotes. c) It forms during the S-phase of the cell cycle. d) It is absent in mature RBCs.
Option (a) is too restrictive — antigen A appears across both kingdoms in Blood Composition And Types.
NCERT Class 11/12 clearly states the correct attribution.
Answer: (d). Mature RBCs lack most organelles including the one in question — a recurring NEET trap.
PYQ 2 — CBSE Board 2021
Question. Define antigen B and give two examples from Blood Composition And Types. (3 marks)
Write the textbook line verbatim if you remember it. Precision matters in 3-mark answers.
One classic NCERT example + one application-based example gives the evaluator confidence you understand, not just memorised.
A model answer would be: definition (1 mark) + example 1 with a short phrase explaining relevance (1 mark) + example 2 (1 mark). That’s the full 3.
PYQ 3 — NEET 2022 Assertion-Reason
Assertion (A): Rh factor plays a central role in Blood Composition And Types. Reason (R): It participates directly in energy transfer within the cell.
True — NCERT supports this directly.
True, but is R the actual reason for A? Often NEET makes R a related-but-unrelated truth.
Most likely answer: Both A and R are true, but R is NOT the correct explanation of A (option 2 in NEET pattern). Always test causality explicitly.
PYQ 4 — NEET 2020
Question. Arrange the following events of Blood Composition And Types in the correct sequence: (i) agglutination, (ii) initiation, (iii) termination, (iv) regulation.
Initiation always comes first, termination last. Regulation and agglutination sit in the middle based on mechanism.
(ii) → (iv) → (i) → (iii) is the usual NCERT sequence.
Answer: (ii) → (iv) → (i) → (iii). Sequence questions in biology reward clean diagrams — redraw the flow before marking.
PYQ 5 — CBSE Board 2023
Question. Explain the significance of antibody in Blood Composition And Types. (5 marks)
One-sentence definition.
A short paragraph or labelled flow showing how it operates.
Two distinct biological roles, each with an example.
Structure: intro + mechanism + role 1 + role 2 + one-line conclusion. Five marks, five chunks — easy to aim for.
Time management for PYQs: 45 seconds for MCQs, 3 minutes for 3-mark subjective, 6 minutes for 5-mark. Train yourself to the clock.
What PYQs Tell Us About Blood Composition And Types
Three patterns show up year after year:
- Definition-based MCQs (easy, do not miss).
- Exception-based MCQs (“which of the following is NOT…” — requires careful reading).
- Diagram-based subjective questions in board exams.
Cover all three and you’ve secured the weightage from Blood Composition And Types in any exam.
Quick Recap
- Review at least 5 years of PYQs per chapter.
- Mark every exception in NCERT.
- Practise assertion-reason with causality testing.
- Write structured 5-mark answers in chunks.
PYQs aren’t just practice — they’re the syllabus in disguise. Abo and rh blood groups, agglutinogens, agglutinins, and universal donors/recipients keeps showing up, and now you know how to handle it.