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

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

Blood group $AB$ has

If a child has blood group '$O$',which of the following blood groups cannot be present in their parents?

After examining the blood groups of a husband and wife,the doctor advised them not to have more than one child. The blood groups of the couple are likely to be:

Which of the following can be considered as the blood bank of the human body?