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CBSE Class 12-science Answered

  On spraying Bacillus thuringiensis on an infected cotton crop field the pests are killed by the toxin, however the toxin although produced by the bacteria does not affect it. Explain giving reason.
Asked by Shiwani.Sawant | 17 Mar, 2023, 10:58: AM
answered-by-expert Expert Answer
Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as army worms, beetles, flies, and mosquitoes. B. thuringiensis forms crystals of protein during their growth that comprise of a toxic insecticidal protein. The Bt toxin protein exist as inactive protoxins but once an insect ingests the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals. 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.
Answered by Sheetal Kolte | 17 Mar, 2023, 11:08: AM
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