The Bt toxin is not toxic to human beings because

The pro Bt toxin activation requires temperature above human body temperature.

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The Bt toxin recognizes only insect-specific targets.

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The Bt toxin formation from pre Bt toxin requires pH lower than that present in human stomach.

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Conversion of pro Bt toxin to Bt toxin takes place only in highly alkaline conditions.

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Solution

The correct option is D Conversion of pro Bt toxin to Bt toxin takes place only in highly alkaline conditions.
The pro Bt toxin is converted into an active form in alkaline pH(higher than found in humans).

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

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