Haematopoiesis in adults occurs at:

Correct option is C

Ans. (c) Red bone marrow
Sol. In adults, haematopoiesis (the formation of blood cells) primarily occurs in the red bone marrow of flat bones like the sternum, ribs, pelvis, and vertebrae.
Explanation of each option:
· (a) Liver – Involved in fetal haematopoiesis, not in adults.
· (b) Spleen – Also contributes to fetal haematopoiesis, and in adults only during certain pathological conditions.
· (c) Red bone marrow – Correct. Primary site of blood cell formation in adults.
· (d) Yellow bone marrow – Composed mostly of fat and does not form blood cells under normal conditions.