Draw a well-labelled diagram of an antibody molecule.

What is interferon

Identify the wrong statement with reference to immunity.

 What is the role of spleen in Human body?

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

Physical barrier = .............. and physiological barrier = .............