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Answer: 3. Alkaline pH of gut

Key idea: The Bt protoxin is activated by alkaline pH.

Bt toxin crystals exist as inactive protoxin. In the alkaline midgut of the insect, the crystals dissolve and become active toxin, which binds midgut epithelial cells, creates pores, causing cell swelling and lysis, killing the insect.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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