How is the Bt toxin activated?

How is the Bt toxin activated?
  1. By the alkaline pH of the gut
  2. By the insect ingesting the inactive toxin
  3. By forming protein crystals
  4. By causing cell swelling and lysis

Solution

Actually, the Bt toxin protein exist as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.

Asked in: NCERT

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