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In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to:

1. Acidic pH of the insect gut
2. Action of gut micro-organisms
3. Presence of conversion factors in insect gut
4. Alkaline pH of the insect gut

Correct answer: Alkaline pH of the insect gut

Solution

Bt cotton produces the toxin in an inactive protoxin form. In the insect gut, the alkaline pH helps convert this protoxin into the active toxin, which can then bind to gut cells and kill the insect.

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