Monocytes constitute what percentage of total $W.B.C.$ (in $\%$)?

Between persons of which two blood groups is the blood transfusion not possible?

The ratio of $RBC$ to $WBC$ in man is (in $: 1$)

Which test tube from the given options is $NOT$ used for keeping blood in a non-coagulated state for the analysis of blood corpuscles?

How many statements is/are incorrect?
$(A)$ Blood is a special epithelial tissue
$(B)$ Albumins are needed for clotting
$(C)$ Plasma with the clotting factors is called serum
$(D)$ Plasma is a straw coloured, viscous fluid

The most well-known blood grouping system is the $ABO$ system. It is named $ABO$ and not $ABC$ because the $\text{O}$ in it refers to having: