ISEE Reading Question 527: Answer and Explanation
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Question: 527
5. The instinct to migrate is triggered primarily by
- A. longer days.
- B. warmer temperatures.
- C. increased activity of predators.
- D. insufficient food supplies.
Correct Answer: D
Explanation:
D is correct. This detail is found in paragraph 2, which states that the main trigger for migration "is depletion of the food supply, as when insets go into hibernation or when snow cover makes seeds inaccessible." Choice A is incorrect because migration is triggered by "diminishing daylight," not longer days. Choice B is incorrect because "impending cold weather," not warmer weather, is a factor that encourages migration. Choice C is incorrect because it is not supported by information in the passage.