Question

Which of the following genes was introduced in com plants to make them resistant to corn borer?

• A. cry IAc
• B. cry IIAb
• C. cry IAb
• D. Both $\left(2\right)$ and $\left(3\right)$

Answer 1

The correct option is C cry IAb

Specific Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into several crop plants. 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.

So the correct answer is cry IAb.