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Expression of IdeasMediumExplaining a cause from the notes

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Bread goes stale mainly because its starch recrystallises as it cools. - Recrystallisation happens fastest at refrigerator temperatures. - Freezing stops the process almost completely. - Bread stored at room temperature stays soft longer than bread stored in a refrigerator.

The student wants to explain why refrigerating bread makes it go stale faster. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Bread goes stale as its starch recrystallises, and that process runs fastest at refrigerator temperatures.Correct
  2. B. Bread stored at room temperature stays soft longer than refrigerated bread.
  3. C. Freezing bread stops it going stale almost completely.
  4. D. Refrigerators dry bread out, which makes it stale.

Answer: A. Bread goes stale as its starch recrystallises, and that process runs fastest at refrigerator temperatures.

The goal asks WHY. Choice A gives the mechanism and its temperature dependence.

Why the other answers are wrong

B. Bread stored at room temperature stays soft longer than refrigerated bread.
This restates the fact to be explained without explaining it.
C. Freezing bread stops it going stale almost completely.
This is about freezing, not refrigerating.
D. Refrigerators dry bread out, which makes it stale.
The notes attribute staling to recrystallisation, not drying.

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