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Standard VI
Biology
Question

During colder months many animals, including fish, enter a state of decreased metabolic activity called torpor. Torpor is characterized by a significant reduction in an animal's metabolic rate, and the graph illustrates the relationship between oxygen consumption in fish and environmental temperature.
Which statement provides the best explanation for this phenomenon?
526895_590a985c700e42adb962cb6f8c3917fa.png
  1. Fish consume less oxygen during colder temperatures because lowering respiration rate is an adaptation that allows fish to conserve free energy during unfavorable conditions.
  2. Fish consume more oxygen during warmer temperatures because their respiration rate slows down, and this adaptation allows them to use more free energy.
  3. Fish consume less oxygen during colder temperatures because their respiration increases to compensate for cold weather. This adaptation allows fish to conserve free energy during unfavorable conditions.
  4. Fish use less energy during colder temperatures, so their respiration increases to as an adaptive response.

A
Fish use less energy during colder temperatures, so their respiration increases to as an adaptive response.
B
Fish consume less oxygen during colder temperatures because their respiration increases to compensate for cold weather. This adaptation allows fish to conserve free energy during unfavorable conditions.
C
Fish consume less oxygen during colder temperatures because lowering respiration rate is an adaptation that allows fish to conserve free energy during unfavorable conditions.
D
Fish consume more oxygen during warmer temperatures because their respiration rate slows down, and this adaptation allows them to use more free energy.
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