Q.

Cry II Ab and cry I Ac produce toxins that control

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cotton bollworms and corn borer respectively.

cotton borer and cotton bollworms respectively

tobacco budworms and nematodes respectively.

nematodes and tobacco budworms respectively

answer is A.

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Detailed Solution

Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into several crop plants such as cotton. The toxin is coded by gene named cry. Two cry genes - cry I Ac and cry II Ab have been incorporated in cotton. The proteins encoded by genes cry II Ab and cry I Ac control cotton bollworms and that of cry I Ab controls cornborer.

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