NEET 2015 Biology question

In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to :-

(1)Acidic pH of the insect gut
(2)Action of gut micro-organisms
(3)Presence of conversion factors in insect gut
(4)Alkaline pH of the insect gutCorrect

Answer: (4)

Solution

The Bt toxin protein (Cry protein) from *Bacillus thuringiensis* is present in the bacterium (and in the transgenic plant) as an inactive protoxin. When an insect ingests it, the alkaline pH of the insect gut solubilises the crystals and activates the

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Question ID VK-091723