Bt-toxin is insecticidal because

Biology Biotechnology and Its Application Biotechnology Application in Agriculture Single Correct MCQ

Published on: August 12, 2026

Activated toxin binds to the surface of midgut epithelial cells and creates pores that causes swelling and lysis and eventually cause death of the insect.

It decreases the growth of the nervous system of the insect.

It makes the insects unable to fly

It kills insects by affecting its blood flow.

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The correct answer is:

Bacillus thuringiensis (Bt) produces a crystalline protoxin. When an insect feeds on it, the alkaline pH of the insect gut activates the toxin. The activated toxin binds to receptors on the midgut epithelial cells, forms pores in the cell membrane, causing cell swelling, lysis, and ultimately death of the insect.

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