Fibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme........

The role of the spleen in mammals is . . . . . . .

Statement-$I$ : Two surface antigens may be present on the $\text{RBCs}$.
Statement-$II$ : Antigens are chemicals that can induce immune response.

The medium of plasma is

Select the correct Rh-blood groups of the parents,whose child is affected with erythroblastosis fetalis.

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.