The yolk of an egg in vertebrates is formed in the:

Which $WBC$ act as phagocytes?

Which vitamin helps in blood clotting?

Examination of blood of a person suspected of having anaemia shows large,immature,nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following is likely to alleviate his symptoms?

Plasma is a straw-coloured,viscous fluid constituting nearly $A$ $\%$ of the blood,$B$ $\%$ of the plasma is water,and proteins constitute $C$ $\%$ of it. Choose the correct option for the blanks $A, B$,and $C$.

Which enzyme is useful to convert inactive fibrinogen into fibrins?