Discussion
Consider the following pairs of storage measure and what it controls:
Aeration - Temperature and moisture migration
Fumigation - Insect infestation
Hermetic sealing - Oxygen available to insects
Precooling - Moisture content of grain
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three pairs are right. Aeration controls temperature and, by removing gradients, moisture migration; fumigation controls insect infestation; and hermetic sealing controls the oxygen available to insects, since respiration in a sealed space depletes it.
The fourth is wrong. Precooling controls the temperature of harvested produce, removing field heat to slow respiration. It has nothing to do with the moisture content of grain - indeed it applies to perishables rather than to grain at all.
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