Q.

The first bioinsecticide developed commercially on a large scale is 

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a

DDT

b

Quinine

c

Sporeine

d

Organophosphate

answer is C.

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Detailed Solution

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The first bioinsecticide developed commercially on a large scale is Sporeine. It was derived or isolated from the bacteria Bacillus thuringiensis.

The active ingredient in this bacteria is a toxic protein which gets activated in the alkaline pH of the insects.
The protein binds to specific sites and creates pores on the midgut of insects which destroy the pests.

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The first bioinsecticide developed commercially on a large scale is