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Solution


Q.

What triggers activation of protoxin to active toxin of Bacillus thuringiensis in bollworm          [2019]
1 Acidic pH of stomach  
2 Body temperature  
3 Moist surface of midgut  
4 Alkaline pH of gut  

Ans.

(4)

Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans and dipterans. B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein which 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 solubilizes the crystals.