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Topic Blood groups
Asked 5 times across 2 UPSC exams over 33 years (1981–2014), peaking in 2011.
Key insights
- Most tested in CSE — 4 of 5 PYQs
- Most asked in 2011
- Recurs across 5 years (1981–2014)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CSE 1981 → CDS 2014
How the concept evolved
Largely a pre-2016 idea — watch for a comeback.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2014
Which of the statements given below are correct?
- A person having blood group 'A' can donate blood to persons having blood group 'A' and blood group 'AB'
- A person having blood group 'AB' can donate blood to persons having blood group 'A', 'B', 'AB' or 'O'
- A person with blood group 'O' can donate blood to persons having any blood group
- A person with blood group 'O' can receive blood from the person of any of the blood groups
- A 1, 2 and 3
- B 1 and 2 only
- C 2 and 4
- D 1, 3 and 4 ✓
✓ Correct answer: (D)
Science & Technology › Biology & Health
CSE2011
A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive and O positive. The blood group of the adopted son is:
- A O positive ✓
- B A positive
- C B positive
- D Cannot be determined on the basis of the given data
✓ Correct answer: (A)
Science & Technology › Biology & Health
CSE1994
If father has blood group A and mother has blood group 0 , then which one of the following blood group may be found in their son?
- A B
- B AB
- C 0 ✓
- D B, AB or0
✓ Correct answer: (C)
Science & Technology › Biology & Health
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