Which of the following statements is incorrect?

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

In rabbit,the function of the spleen is

The medium of plasma is

Hematology is the study of

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.