Active Passive Immunity

Cornea transplant in humans is almost never rejected. This is because:

1. its cells are least penetrable by bacteria

2. it has no blood supply

3. it is composed of enucleated cells

4. it is a non-living layer

Which of the following immunoglobulins constitute the largest percentage in human milk?

1. IgD

2. IgM

3. IgA

4. IgG

Colostrum, the yellowish fluid, secreted by the mother during the initial days of lactation is very essential to impart immunity to newborn infants because it contains:

1.	Immunoglobulin A	2.	Natural killer cells
3.	Monocytes	4.	Macrophages

The yellowish fluid "colostrum" secreted by mammary glands of the mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. This type of immunity is called as:

1.	Passive immunity	2.	Active immunity
3.	Acquired immunity	4.	Autoimmunity

Which of the following type of immunity is present at the time of birth and is a non-specific type of defence in the human body?
1. Cell-mediated Immunity
2. Humoral Immunity
3. Acquired Immunity
4. Innate Immunity