Which of the following are agranulocytes?

Write a short note on $ABO$ blood grouping.

Which of the following statements are correct regarding thrombocytes?
$I$ - Also known as blood platelets.
$II$ - They are cell fragments.
$III$ - Produced from megakaryocytes.
$IV$ - Their count in a normal individual ranges from $3,50,000$ to $6,00,000$ per $mm^3$.
$V$ - Involved in the process of blood coagulation.

Select the $CORRECT$ match:

Column-$I$	Column-$II$	Column-$III$
$i$. Monocyte	$d$. Kidney shaped nucleus	$n$. Phagocytic
$ii$. Lymphocyte	$a$. Large round nucleus	$o$. Produce antibodies
$iii$. Basophil	$b$. Twisted nucleus	$m$. Release heparin
$iv$. Eosinophil	$c$. Bilobed nucleus	$l$. Antihistamine property

Blood does not clot inside the blood vessels due to the presence of

Give the differences between $RBCs$ and $WBCs$.