Q.

Which of the following is true with respect to Bt toxin?

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Bt protein exists as active toxin in Bacillus

The inactive protoxin gets activated into active toxin in the insect gut

Bt toxin prevents DNA replication in infected pests

It uses RNAi to check the growth of pests

answer is B.

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Detailed Solution

The Bt toxin protein exist as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.

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