(i) Blood is a carrier of oxygen and food to all cells of the body. It also collect waste from all parts of the body and carries them to liver and kidney for disposal. (1)
(ii) Three types of blood cells are White Blood Cells (WBCs), Red Blood Cells (RBCs), Platelets. (1)
(a) RBCs transport respiratory gases, oxygen and carbon dioxide.
(b) WBCs fight with diseases by producing antibodies and engulfing the germs.
(c) Blood platelets helps in clotting of blood. (1)
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