20th ques

20th ques O 0

Dear student.

The correct option is.

‚ÄčAns. (3) Bind with the epithelial cell of midgut of the insect pest ultimately killing it.

Bacillus thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein. The Bt toxin protein exists 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 solubilizes the crystals. The activated toxin binds to the surface of midgut epithelial cells and creates pores that cause swelling and lysis and eventually cause death of the insect.   

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