The chief difference between $RBCs$ of human and frog is:

Which of the following vitamins is essential for the maturation of erythrocytes?

Choose the incorrect sentence$(s)$.
$(I)$ $RBCs$ are formed in the white bone marrow in adults.
$(II)$ $RBCs$ have a red colour because of the presence of a protein called haemoglobin.
$(III)$ The nucleus is present in $RBCs$ in most mammals,and they are biconcave in shape.
$(IV)$ $A$ healthy individual has $12-16 \, g$ of haemoglobin in every $100 \, ml$ of blood.

In which of the following situations is there a risk factor for children of incurring erythroblastosis fetalis?

What is the percentage of the white blood cell shown below in the blood?

Which of the following does not play a role in blood coagulation?