NEET 2026 Botany Bt Cotton MCQ Question
The toxin proteins isolated from Bacillus thuringiensis, coded by which of the following genes would control cotton bollworms and corn borer, respectively?
cryIAc and cryIAb
cryIAc and cryIIAb
cryIIAb and cryIAc
cryIAc and cryIIIAb
Correct Answer
Detailed Explanation
Specific Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into 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 cryIAc and cryIIAb control the cotton bollworms, that of cryIAb controls corn borer. So, the correct answer is cryIAc for cotton bollworms and cryIAb for corn borer that is represented in option (1).
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