Discussion
A store manager proposes ventilating a hermetic structure weekly to keep the grain fresh. This is
Answer: B
Correct answer: Misguided: ventilation restores the oxygen
The proposal would defeat the storage method. Hermetic storage works because respiration inside a sealed structure depletes the oxygen and raises the carbon dioxide until the atmosphere kills the insects; weekly ventilation would restore the oxygen each time and reset the process before it could take effect.
Nor would the grain be kept fresher - the low-oxygen atmosphere is itself what preserves it, and admitting fresh air also admits moisture. Condensation is managed by storing grain dry and by the structure's insulation, not by breaking the seal.
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