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Q.

Inactive Bt toxin converted in to active Bt-toxin due to 

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a

acidic pH of gut of insect

b

always occur in inactive form in insect

c

neutral pH of gut insect

d

alkaline pH of gut insect

answer is B.

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Detailed Solution

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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