Q177 / 180 · NEET 2015 (Phase 1) · Zoology

In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to:

  • Correct answer
    A
    Alkaline pH of the insect gut
  • B
    Acidic pH of the insect gut
  • C
    Action of gut micro-organisms
  • D
    Presence of conversion factors in insect gut

Solution

Bacillus thuringiensis which contain cry protein in inactive form known as pro-toxin. When this is ingested by insect it get activated by alkaline ph of gut, which solubilize the protein crystal. This activated toxin bind to the epithelial midgut cell result into lysis of epithelial cell and eventually lead to the death of insect.

Hence, the correct answer is option: 'A'.

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