Crystals of Bt toxin produced by some bacteria do not kill …

Biology Biotechnology and Its Application NCERT Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because

bacteria are resistant to toxin

toxin is immature

toxin is inactive

bacteria enclose toxin in a special sac

Text Solution

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The correct answer is:

Bacillus thuringiensis produces Bt toxin as an inactive protoxin. It becomes active only in the alkaline gut of insects, so it does not harm the bacteria itself.

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