Interferons are secreted by:
1. Liver
2. Spleen
3. Virus infected cells
4. Lymphocytes

The type of immunity responsible for graft rejection by a recipient body is 
1. Innate immunity 
2. Humoral immunity 
3. Cell mediated immunity 
4. Either 2 or 3 

The secretion of antibodies by B lymphocytes provides:
1. Passive immunity 
2. Humoral immunity 
3. cell mediated immunity 
4. Innate immunity 

Primary lymphatic organs serve as the site for:

1. antibody formation

2. lymph formation

3. lymphocytes to encounter and bind to antigens

4. lymphocyte formation and maturation

Consider the following statements:

I. Innate immunity is non-specific type of defence, that is present at the time of birth.

II. Acquired immunity is pathogen specific and is characterized by memory

III. Memory-based acquired immunity developed in higher vertebrates based on ability to distinguish self from non-self

Which of the following statements are true?

1. I and II only

2. I and III only

3. II and III only

4. I, II and III