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

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

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

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

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.