Match List I with List II regarding Bacillus thuringiensis and its toxins. List I List II A. cryIAc and cryIIAb I. Corn borer B. cryIAb II. Cotton bollworms C. Inactive Bt toxin III. Alkaline pH of gut D. Active Bt toxin IV. Protoxin Choose the correct answer from the options given below:

Step-by-step solution

The toxin proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms (A-II). The toxin protein encoded by the gene cryIAb controls the corn borer (B-I). The Bt toxin protein exists as an inactive protoxin in the bacterium (C-IV). Once the insect ingests the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilises the crystals (D-III). Answer: A-II, B-I, C-IV, D-III