Expression of IdeasMediumExplaining why a practice works
Expression of Ideas practice question
While researching a topic, a student has taken the following notes:
- Farmers plant clover between crops.
- Bacteria in clover roots take nitrogen from the air and fix it in the soil.
- Crops need nitrogen to grow.
- Fields rested under clover need less fertiliser the following year.
The student wants to explain why farmers plant clover between crops. Which choice most effectively uses relevant information from the notes to accomplish this goal?
- A. Bacteria in clover roots fix nitrogen from the air into the soil, so a field rested under clover needs less fertiliser for the next crop.Correct
- B. Farmers plant clover between crops.
- C. Crops need nitrogen.
- D. Clover has roots.
Answer: A. Bacteria in clover roots fix nitrogen from the air into the soil, so a field rested under clover needs less fertiliser for the next crop.
The mechanism and the payoff.
Why the other answers are wrong
- B. Farmers plant clover between crops.
- Restates the practice.
- C. Crops need nitrogen.
- One fact, no link to clover.
- D. Clover has roots.
- Trivial.
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