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Expression of IdeasHardContrasting day and night states

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A hummingbird's heart can beat up to 1,200 times a minute while it is active. - At night, many hummingbirds enter a state called torpor. - In torpor, the heart slows to about 50 beats a minute and body temperature falls. - Torpor saves energy. The student wants to contrast the hummingbird's active state with its state in torpor.

Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. While active, a hummingbird's heart can beat 1,200 times a minute, yet in night-time torpor it slows to about 50 beats a minute as the bird saves energy.Correct
  2. B. A hummingbird's heart can beat up to 1,200 times a minute.
  3. C. Torpor saves energy.
  4. D. At night, many hummingbirds enter a state called torpor.

Answer: A. While active, a hummingbird's heart can beat 1,200 times a minute, yet in night-time torpor it slows to about 50 beats a minute as the bird saves energy.

Both states, both rates, contrasted.

Why the other answers are wrong

B. A hummingbird's heart can beat up to 1,200 times a minute.
The active state only.
C. Torpor saves energy.
A purpose, no contrast.
D. At night, many hummingbirds enter a state called torpor.
Torpor named but not described.

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