Discussion
Assertion (A): Fumigation is a substitute for good store hygiene and sealing.
Reason (R): A lethal gas concentration must be maintained throughout the exposure period.
Select the correct answer from the options below.
Answer: C
Correct answer: A is false but R is true
The assertion is false. Fumigation is no substitute for hygiene and sealing - it is a corrective treatment that depends on both.
The reason is true and explains why: a lethal gas concentration must be maintained throughout the exposure period, which for phosphine means several days, and only a well-sealed structure can hold it. A leaky store gives a sublethal exposure that kills the susceptible insects and selects for the resistant ones. Residues in cracks and spillage reinfest the grain as soon as the gas clears, so hygiene determines how soon fumigation is needed again.
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