Reticulocytes may also be called

Explain the concentration of platelets in human blood.

pH of human blood is . . . . . . .

$A$ significant decrease in the number of lymphocytes due to a deficiency of folic acid is known as:

When red blood corpuscles containing both $A$ and $B$ antigens are mixed with your blood serum,they agglutinate. Hence,your blood group is . . . . . . type.

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a)$ Eosinophils	$(i)$ Immune response
$(b)$ Basophils	$(ii)$ Phagocytosis
$(c)$ Neutrophils	$(iii)$ Release histaminase,destructive enzymes
$(d)$ Lymphocytes	$(iv)$ Release granules containing histamine