Question

Sol. [Key Concept: Bt toxin — cry genes of Bacillus thuringiensis]

Specific Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into the several crop plants such as cotton. The choice of genes depends upon the crop and the targeted pest, as most Bt toxins are insect-group specific. The toxin is coded by a gene named cry. The proteins encoded by the genes crylAc and cryllAb control the cotton bollworms, that of crylAb controls corn borer. So, the correct answer is crylAc for cotton bollworms and crylAb for corn borer that is represented in option (1)