Discussion
Statement I: Fumigation succeeds regardless of how well the structure is sealed.
Statement II: A lethal gas concentration must be held for the whole exposure period.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect. Fumigation depends entirely on how well the structure is sealed - a leaky store loses gas faster than it can act.
Statement II is correct and is why: the kill depends on holding a lethal concentration for the whole exposure period, which for phosphine means several days, because the gas must penetrate the bulk and reach eggs and pupae as well as adults. A partial exposure kills the susceptible individuals and leaves the resistant ones to breed, so poor sealing actively selects for resistance.
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