Which of the following is incorrect with respect to Bt toxin?

• A

  Bt toxin does not kill the bacteria themselves because toxin proteins occur in inactive form called protoxin.

• B

  Toxin can kill certain insects such as dipterans, coleopterans, and lepidopterans.

• C

  Bt toxin is commonly used to produce herbicide-resistant GM crops.

• D

  When an insect ingests an inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut that solubilises the protein crystals.