Which of the following is a cell fragment?

Fluid exuding from the clotted blood is

Vitamin-$K$ is essential for:

Properties of human $RBCs$ are:
$I.$ Devoid of nucleus
$II.$ Formed in bone marrow
$III.$ Possess healing properties
$IV.$ Biconcave in shape
$V.$ Help in blood clotting
Choose the option with correct properties.

What is the average amount of hemoglobin present in $100 \ ml$ of blood?

The smallest $WBC$ is . . . . . . .