Class 12 NEET Biology Human Health and Diseases Questions Part 1

(c) : The normal count of WBCs is 5000 to 10000 per cubic millimeter of blood. Leukaemia or blood cancer is characterized by abnormal increase of WBCs count, 20000−1000000∕mm3 due to their increased formation in the bone marrow. Haemolysis is breakdown of RBCs. Haemophilia is a disease in which blood clots slowly. Thrombosis is a clot formation inside the blood vessels.