Formed Elements & Blood Groups — NEET Biology MCQs with Solutions
Free NEET Biology Formed Elements & Blood Groups MCQs with step-by-step solutions (6 questions). Part of Body Fluids and Circulation. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Formed Elements & Blood Groups · easy · theory
The most abundant blood cells, which carry oxygen and lack a nucleus in humans, are the:
A. Erythrocytes (RBCs) ✓ Correct
B. Leucocytes (WBCs)
C. Thrombocytes (platelets)
D. Lymphocytes
Solution: RBCs (~5 million/mm³) are enucleate, biconcave and packed with haemoglobin for O₂ transport.
Q2 — Formed Elements & Blood Groups · easy · theory
A person with blood group AB is called a universal ______ because:
A. Recipient; RBCs have no antigens
B. Donor; RBCs have no antigens
C. Recipient; plasma has no anti-A or anti-B antibodies ✓ Correct
D. Donor; plasma has both antibodies
Solution: AB individuals lack anti-A/anti-B antibodies, so can receive any ABO type — universal recipients.
Q3 — Formed Elements & Blood Groups · medium · theory
The granulocyte most abundant among WBCs, phagocytic and the first to reach infection sites, is the:
A. Basophil
B. Eosinophil
C. Lymphocyte
D. Neutrophil ✓ Correct
Solution: Neutrophils (~60–65% of WBCs) are phagocytic and combat infection; lymphocytes handle immunity.
Q4 — Formed Elements & Blood Groups · medium · theory
A person with blood group O is the universal donor because their RBCs:
A. Have Rh antigen only
B. Have no antibodies
C. Have both A and B antigens
D. Have neither A nor B antigens ✓ Correct
Solution: O-group RBCs carry no A/B surface antigens, so they can be given to any ABO recipient.
Q5 — Formed Elements & Blood Groups · hard · theory
Erythroblastosis foetalis occurs when:
A. An Rh⁻ mother carries an Rh⁺ foetus and her anti-Rh antibodies attack the foetal RBCs ✓ Correct
B. Both parents are Rh⁻
C. An Rh⁺ mother carries an Rh⁻ foetus
D. The foetus is blood group O
Solution: In a second Rh⁺ pregnancy, maternal anti-Rh antibodies cross the placenta and destroy foetal RBCs.
Q6 — Formed Elements & Blood Groups · hard · theory
The formed elements of blood are produced (haematopoiesis) mainly in the ______ in adults:
A. Red bone marrow ✓ Correct
B. Spleen only
C. Liver
D. Thymus only
Solution: In adults, red bone marrow is the main site of blood cell formation.