A protoxin is

Match the organism with its use in biotechnology.

Assertion $\left(\mathrm{A}\right):$ Bt toxin exists as inactive prototoxin but once an insect ingests the inactive toxin, it is converted into an active form of toxin.

Reason $\left(\mathrm{R}\right):$  Protoxin gets activated in insect gut due to the acidic $\mathrm{pH}$ in the gut, which solubilises the protein crystals.

The correct answer is:

To conduct detailed study into disease causing organism in livestock, Biosafety laboratory has been setup in India in:

1. Ludhiana 

2. Bengaluru 

3. Anand 

4. Allahabad 

Assertion A: In Bt cotton B. thuringiensis produces a toxic insecticidal crystalline protein which destroys bollworms.

Reason R: B. thuringiensis produces this toxic protein in an inactive form, but when an insect ingests this inactive protein, it is converted into active form of toxin due to the alkaline pH of gut which solubilises the crystals, which is responsible for the death of bollworm.

Assertion (A) : Transgenic Golden Rice is rich in Vitamin A and prevents blindness.

Reason (R) : It is obtained from "Taiwan"