First slide

Biotechnological Applications in Agriculture

Question

Which of the following statement is correct about Bt toxin ?

Easy

A

Bt protein exists as active toxin in the Bacillus.
B

The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication.
C

The concerned Bacillus has antitoxins.
D

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

Solution

The inactive protoxin gets converted into active form in the insect gut due to the alkaline pH of the gut which solubilises the crystals.
Bt toxin in present in the inactive form in Bacillus.
The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of the insect.
Bacillus does not have antitoxins but toxin is inactive. The toxin becomes active only when it reaches the gut of the insect.

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