Which of the following cytoplasmic granules contain histamine?

Which are the main blood groups found in humans on the basis of antibodies and antigens?

In erythroblastosis foetalis,which factors of the mother pass through the placenta into the foetus?

Squeezing of leucocytes out from the endothelium of capillaries to fight foreign agents is known as

Which of the following blood corpuscles secrete serotonin?
$I$. Basophils $\quad$ $II$. Eosinophils
$III$. Thrombocytes $\quad$ $IV$. Lymphocytes
$V$. Monocytes
Select the correct option from the following:

$A$ person with antigen $A$ in $RBC$ and antibody $b$ in plasma belongs to blood group