Statement I : The choice of genes not depends upon the crop and the targeted pest, as most Bt toxins are not insect group specific.

Statement II : Proteins encoded by the genes crylAc and cryllAb control the corn borer, that of crylAb controls cotton bollworms      

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. There are a number of them, for example, the proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms, that of cryIAb controls corn borer.