A-plasma, B-inactive, C-serum [table] Blood Plasma | Blood Serum ; (i) Fluid portion of the blood in the form of matrix | Fluid collected after the clot reaction ; (ii) Has fibrinogen and other clotting material | Does not have fibrinogen and other clotting material ; (iii) Takes part in blood clotting | Don’t take part in blood clotting ; (iv) It is straw coloured clear liquid | It is pale yellow in colour [/table]