a) 1) Red blood corpuscles, 2) White blood corpuscles, 3) Platelets, 4) Blood plasma.b) RBCs lack nucleus whereas, WBCs have a nucleus. RBC has a biconcave shape while the shape of WBC is irregular.c) Functions:- 1) RBCs- Its main function is to carry oxygen from the lungs to the body tissues and also carry carbon dioxide as a waste product away from tissues to lungs. Haemoglobin protein in RBCs helps in carrying oxygen.2) WBCs- Its main function is to fight infection by preventing the entry of foreign particles.3) Platelets:- Its main function is to prevent bleeding by clotting blood.d) The life span of RBC is 120 days.e) Fibrinogen is the soluble plasma protein that helps in blood clotting.