9. White blood cell act A.As a defence against infection B.As a source of energy C.For clotting blood D.As a medium for oxygen transport from lung to tissues
Answer: Option A Solution: White blood cell, also called leukocyte or white corpuscle, a cellular component of the blood that lacks hemoglobin, has a nucleus, is capable of motility, and defends the body against infection and disease by ingesting foreign materials and cellular debris, by destroying infectious agents and cancer cells.
