Most Bt toxins are:

Insect group specific

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Specific for fungal species

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Nematode group specific

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Specific for protozoans

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Solution

The correct option is A Insect group specific
Specific Bt toxin genes were isolated from B. thuringiensis and incorporated into several crop plants. The choice of genes depends on the crop and the targeted pest. Most Bt toxins are insect-group specific.

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