What is true about Bt toxin ?

Options

A. The inactive protoxin gets converted into active form in the insect gut
B. Bt protein exists as active toxin in the Bacillus
C. The activated toxin enters the ovaries of the pest to sterilize it and thus prevent its multiplication
D. The concerned Bacillus has antitoxins

Answer

A

Explanation

The Bt toxin protein exists as inactive protoxin but once an insect ingests the inactive toxin it is converted into an active form of toxin due to the alkaline pH of the alimentary canal which solubilises the crystals. The activated toxin binds to the surface of midgut epithelial cells and creates pores that causes cell swelling and lysis and eventually cause death of the insect.