Q.
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a
Bt toxin protein exist as inactive protoxins.
b
Proteins derived from Bacillus thuringiensis kill insects of only lepidopterans of Insecta.
c
Some strains of Bacillus thuringiensis produce proteins that have insecticidal properties.
d
Once an insect ingest the inactive toxin of Bacillus thuringiensis, it is converted into an active form of toxin due to the alkaline pH of the gut.
answer is B.
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