Select the lymphoid organs from the given choices
$I$. Lymph node $II$. Thymus gland
$III$. Red bone marrow $IV$. liver
$V$. Spleen $VI$. Osteocytes
$VII$. Peyer's patches
The correct option with correct choices is
$I$, $II$, $III$ and $IV$
$III$, $IV$, $V$ and $VI$
$IV$, $V$, $VI$ and $VII$
$I$, $II$, $IV$, $V$ and $VII$
‘First line of defence' is known as
Interferons are
In higher vertebrates, the immune system can distinguish selfcells and non-self. If this property is lost due to genetic abnormality and it attacks selfcells, then it leads to
The old worn out $RBCs$ are filtered out by
Spleen is