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Information and IdeasHardCompleting a line of reasoning

Information and Ideas practice question

Many deep-sea fish have eyes that are enormous relative to their bodies. Since almost no sunlight reaches the depths they inhabit, the eyes cannot be for seeing by daylight. Researchers therefore suspect that the large eyes ____

Which choice most logically completes the text?

  1. A. gather the faint light produced by other deep-sea organisms.Correct
  2. B. help the fish swim faster through the water.
  3. C. are a sign that the fish see poorly.
  4. D. allow the fish to see a wide range of colours.

Answer: A. gather the faint light produced by other deep-sea organisms.

The text rules out daylight as the purpose and asks what the eyes are FOR. Large eyes are for collecting light; in the dark, the only light is what other creatures make. Choice A follows the logic.

Why the other answers are wrong

B. help the fish swim faster through the water.
Eyes don't affect swimming speed, and nothing in the text connects the two.
C. are a sign that the fish see poorly.
Enormous eyes suggest strong light-gathering, not poor sight — and the text treats them as an adaptation, not a defect.
D. allow the fish to see a wide range of colours.
Colour vision needs plenty of light; the text stresses how little there is.

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