Which of the following blood cells has a kidney-shaped nucleus?

Lymphocytes are:

What is the proportion of $Rh$ $^{\text{+ve}}$ individuals in the human population?

Arrange the following formed elements in the decreasing order of their abundance in blood in humans :
$(a)$ Platelets
$(b)$ Neutrophils
$(c)$ Erythrocytes
$(d)$ Eosinophils
$(e)$ Monocytes
Choose the most appropriate answer from the options given below :

Blood examination of an anemic person reveals large,immature,nucleated erythrocytes without hemoglobin. Which of the following,if added to their diet,would alleviate the symptoms?

If you suspect an antibody deficiency in a person,which of the following would you look for as definitive evidence?