Q.

What is true about Bt-toxin ?

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The concerned Bacillus has anti-toxins.

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

Bt-protein exists as active toxin in the Bacillus.

The activated toxin enters the ovary of pest to sterilize it and thus prevents its multiplication.

answer is B.

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Detailed Solution

Bt toxin is produced by a bacterium called Bacillus thuringiensis (Bt for short). B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein. Actually, the Bt toxin protein exists as inactive protoxins 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 solubilises the crystals.

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