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

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alkaline pH of the insect gut

acidic pH of the insect gut

action of gut microorganisms

presence of conversion factors in insect gut

answer is C.

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Detailed Solution

Bt cotton is a transgenic cotton plant variety. The cry genes from B.thuringiensis are expressed as inactive protoxin. It is
Activated at alkaline pH of the insect gut. The soluble form of protoxin (toxin) is lethal to certain groups of insects,
Like lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans.
(1), (2) Neither the gut microbes nor conversion factors of insect have a role in converting protoxin into active toxin.
(4) The pH of insect gut is alkaline and not acidic.

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