How does the Bt toxin cause death of insects?

How does the Bt toxin cause death of insects?
  1. By binding to the surface of midgut epithelial cells
  2. By forming protein crystals
  3. By converting inactive toxin into active form
  4. By causing cell swelling and lysis

Solution

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.

Asked in: NCERT

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