The lifespan of human white blood cells (leukocytes) is approximately ......... .

Match the type of blood cells in Column $I$ with their respective structure in Column $II$ and function in Column $III$ and select the correct option given below.

Column $I$	Column $II$ $\&$ $III$
$I$. Erythrocytes	$D$. Enucleated,biconcave circular in shape; $N$. Transport of gases $O_2$ and $CO_2$.
$II$. Neutrophils	$A$. Spherical large cells,nucleus with many lobes; $O$. Phagocytic in function.
$III$. Lymphocytes	$C$. Spherical nucleus,agranular cytoplasm; $M$. Humoral and cell-mediated immunity.
$IV$. Thrombocytes	$B$. Cellular fragments small,oval shaped; $L$. Clotting of blood.

If a patient with blood group $B$ requires an immediate blood transfusion,which of the following blood types can be given to them?

Which of the following substances,if introduced into the blood stream,would cause coagulation of blood at the site of its introduction?

Which of the following is true about plasma?
$(i)$ It contains $90-92 \%$ water.
$(ii)$ It contains $6-8 \%$ proteins.
$(iii)$ It is a straw-coloured,viscous fluid.

The protein which prevents coagulation of blood in the blood vessel is