Select wrong statements and mark right option for wrong statement.

(i) Platelets also called thrombocytes are cell fragments produced from megakaryocytes.

(ii) Blood normally contains 1,500,00-3,500,00 platelets mm 3 .

(iii) Platelets can release a variety of substances most of which are involved in the coagulation or clotting of blood.

(iv) A reduction in number of platelets can lead to clotting disorders which will lead to excessive loss of blood from the body.

(v) Megakaryocytes is a special cell of the bone marrow.

(vi) Thrombokinase, present in the platelets in an inactive state.