The toxin of Bacillus thuringiensis is activated by

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acidic pH of insect stomach.

high temperature.

alkaline pH of insect gut.

enzymes in insect gut.

answer is C.

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Detailed Solution

The Bt toxin protein exist as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.

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