Cornea trasplant in human is almost never rejected state the reason.

Agrobacterium tumefaciens is a good vector in gene tranfer. State the reason for it.

Noble gases have almost zero electron affinity give reason.

Magnetic lines of force never intersect each other . What is the reason ?

Alkali metals never found in free state in nature. Why?

Give the reasons for increase in human disasters after the World War - II.

The rejection of organ transplanting in humans is prevented from

Valves are important in human heart. Give reason.

Assertion : An organ transplant patient if not provided with cyclosporin A may reject the transplanted organ. Reason : Cycosporin A inhibits activation of T-cells and interferes with destruction of non-self cells.