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Information and IdeasMediumInference from an experimental contrast

Information and Ideas practice question

In the experiment, tomato seedlings grown under light with a higher proportion of blue wavelengths developed thicker stems than seedlings under standard greenhouse light, though their total height was the same. The researchers concluded that ____

Which choice most logically completes the text?

  1. A. blue-rich light altered how the seedlings grew rather than how much they grew.Correct
  2. B. blue-rich light made the seedlings taller.
  3. C. standard greenhouse light produces thicker stems.
  4. D. the seedlings under blue light grew less overall.

Answer: A. blue-rich light altered how the seedlings grew rather than how much they grew.

Same height, thicker stems: a change in form, not in amount.

Why the other answers are wrong

B. blue-rich light made the seedlings taller.
Height was the same.
C. standard greenhouse light produces thicker stems.
Reversed.
D. the seedlings under blue light grew less overall.
Height was the same and stems were thicker, so not less.

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