SSC CGL
MediumQ. No. which-part-of-human-blood-has-no-nucleus
Which part of human blood has no nucleus?
Last Updated:
AWhite blood cells
BPlatelets
CRed blood cells
DBoth RBC and Platelets
Correct Answer: Both RBC and PlateletsYour Answer: D
✅ Correct Answer: D — Both RBC and Platelets
Both Red Blood Cells (RBCs/Erythrocytes) and Platelets (Thrombocytes) lack nuclei in their mature form in humans. RBCs lose their nucleus during maturation to maximize space for haemoglobin and oxygen transport. Platelets are not cells but cell fragments from megakaryocytes, and they naturally have no nucleus.
❌ Why other options are wrong:
• A. White blood cells (WBCs/Leukocytes) — WBCs DO have a nucleus; they use it for immune functions like producing antibodies.
• B. Platelets alone — While platelets lack nucleus, RBCs also lack nucleus, so D (both) is correct.
• C. Red blood cells alone — While RBCs lack nucleus, platelets also lack nucleus, so D (both) is correct.
📝 Important Note: Mature human RBCs and Platelets both lack a nucleus. WBCs have a nucleus. RBCs lifespan: 120 days. WBCs lifespan: varies (hours to years). Platelet lifespan: 8-10 days. This distinction is critical for SSC CGL biology questions.
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