Expression of IdeasEasy–MediumIntroducing a process to a general audience
Expression of Ideas practice question
While researching a topic, a student has taken the following notes:
- Sourdough bread rises without commercial yeast.
- It uses a 'starter': a mix of flour and water in which wild yeasts and bacteria grow.
- The bacteria produce acids that give the bread its tang.
- Starters can be kept alive for decades by regular feeding.
The student wants to explain what makes sourdough rise. Which choice most effectively uses relevant information from the notes to accomplish this goal?
- A. Instead of commercial yeast, sourdough rises thanks to a starter — a mix of flour and water in which wild yeasts grow.Correct
- B. Some starters are decades old.
- C. Sourdough has a tangy taste.
- D. Bread needs flour and water.
Answer: A. Instead of commercial yeast, sourdough rises thanks to a starter — a mix of flour and water in which wild yeasts grow.
No commercial yeast; wild yeasts in a starter: what makes it rise.
Why the other answers are wrong
- B. Some starters are decades old.
- Longevity, not rising.
- C. Sourdough has a tangy taste.
- Flavour, not rising.
- D. Bread needs flour and water.
- Not specific to sourdough or to rising.
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