Q.

Select the incorrect statement

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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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Detailed Solution

Some strains of Bacillus thuringiensis produce proteins that kill certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes).
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