What is the main component of blood plasma?

Identify the cells and their functions based on the provided figure:
$(a)$ Fig. $A$ - Megakaryocyte - formation of platelets
$(b)$ Fig. $B$ - Lymphocyte - synthesis of antibodies
$(c)$ Fig. $A$ - Eosinophil - secrete antihistamine
$(d)$ Fig. $A$ - Neutrophil - secrete heparin

Which blood group contains both $a$ and $b$ antibodies?

Which of the following is not a granulocyte?

Blood groups are named because of the agglutinogens $A$ and $B$ present in:

Blood cells -