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Study the following statements regarding Bt toxins produced by bacterium Bacillus thuringiensis and select the correct one.
(a)Most strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans, coleopterans and dipterans.
(b)Bt toxin proteins do not kill the bacteria themselves because the toxin proteins occur in an inactive form called protoxins.
(c)When an insect ingests the inactive Bt toxin, it is converted to an active form of toxin due to alkaline pH of the gut which solubilises the protein toxin crystals.
(d)All of these.

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