Q.

Bt toxin produced by Bacillus thuringiensis does not kill the bacteria itself because:

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Toxin exists as inactive protoxin in the Bacillus cell.

The acidic pH required for the activation of the toxin is not present in the bacteria

Toxin is only produced in the host organism after induction from host protein

Certain enzymes like methylase deactivates the toxin in the bacteria

answer is A.

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Detailed Solution

The Bt toxin protein exist as inactive protoxins in Bacillus but once an insect ingests 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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