The trigger for activation of toxin of Bacillus thuringiensis is

acidic pH of stomach

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high temperature

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alkaline pH of gut

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mechanical action in the insect gut

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Solution

The correct option is C alkaline pH of gut
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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