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Why does Bt toxin cannot kill the bacter...

Why does Bt toxin cannot kill the bacterium that produces it, but kills the insect that ingests it?

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Bt toxin is produced by a soil bacterium called Bacillus thuringiensis. This toxin does not kill the bacterium which produces it, because in them, it is present in an inactive and crystalline förin. It becomes active and toxic only when it is consumed by insects such as lepidopterans, etc., due to che alkaline pH of the gut.
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Knowledge Check

  • Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because:

    A
    bacteria are resistant to the toxin
    B
    toxin exist as toxoid
    C
    toxin exist as prototoxins
    D
    bacteria encloses toxin in a special sac

  • Bt toxin gene has been cloned from the bacteria and expressed in plants to provide resistance to insects without the need for insecticides. Select these resistant plants from the given list.

    A
    (i), (ii), (iii) and (iv)
    B
    (ii), (iii), (iv) and (v)
    C
    (i), (ii), (v) and (vi)
    D
    All of these

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