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(By Examveda Team)

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.

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C. decrease in thickness of ozone layer in stratosphere

D. increase in the thickness of ozone layer in troposphere