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What is true about Bt toxin?

1. Bt protein exists as active toxin in the Bacillus
2. The activated toxin enters the ovaries of the pest to sterilize it and thus prevents its multiplication.
3. The concerned Bacillus has antitoxins.
4. The inactive protoxin gets converted into active form in the insect gut.

Correct answer: The inactive protoxin gets converted into active form in the insect gut.

Solution

Bt toxin is produced by Bacillus thuringiensis as an inactive protoxin. After the insect ingests it, the alkaline gut environment converts it into the active toxin, which then damages the gut lining.

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