Information and IdeasHardTwo conditions with controls held constant
Information and Ideas practice question
Seedling height after four weeks, with the same soil and the same watering for both groups:
Full sun: 14 cm
Partial shade: 9 cm
A student claims that the seedlings grew taller in full sun. Which choice most effectively uses data from the table to support the claim?
- A. With soil and watering the same, seedlings in full sun reached 14 cm compared with 9 cm in partial shade.Correct
- B. Seedlings in full sun reached 14 cm.
- C. Both groups of seedlings had the same soil.
- D. Seedlings in partial shade reached 9 cm.
Answer: A. With soil and watering the same, seedlings in full sun reached 14 cm compared with 9 cm in partial shade.
The claim is a comparison; choice A gives both heights and notes that the other conditions were equal.
Why the other answers are wrong
- B. Seedlings in full sun reached 14 cm.
- One height, no comparison.
- C. Both groups of seedlings had the same soil.
- A control, not a result.
- D. Seedlings in partial shade reached 9 cm.
- The other height alone, with no comparison.
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