$T$-cells are lymphocytes which produce the cellular immunity. These are developed from

Many microbial pathogens enter the gut of humans along with food. What are the preventive barriers to protect the body from such pathogens ? What type of  immunity do you observe in this case ?

What are pathogens ?
 

Which of the following are Autoimmune disorders?

$A$. Myasthenia gravis  $B$. Rheumatoid arthritis

$C$. Gout  $D$. Muscular dystrophy

$E$. Systemic Lupus Erythematosus ($SLE$)

Choose the most appropriate answer from the options given below:

Mention the importance of Recombinant-DNA technology in terms of Vaccination?

Given below are two statements :

Statement $I$ : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.

Statement $II$ : Both bone marrow and thymus provide micro environments for the development and maturation of T-lymphocytes.

In the light of above statements, choose the most appropriate answer from the options given below :