Q48 - Thermoregulation and the Thermoneutral Zone
Endotherm animals can only tolerate narrow range of body temperature (30-45 degC), but their ability to generate heat internally allowed them to expand their distributions. On the other hand, the cost to be endotherm is high because of their constant demand for food to support the energy needed for heat production.
Figure 1.
Using the information and data, determine which of the statements are true or which are false.
A. In a drastically-changing environment optimal body temperature of an endotherm animal will be largely maintained with minor behavioural adjustments.
B. When body temperature of endotherm animal starts dropping, it triggers the increase of metabolic heat generation, independent of animal habitat.
C. Basal metabolic rate of an endotherm animal stays constant throughout a limited range of environmental temperatures.
D. One way that some endotherm animal species tolerate extreme cold conditions is to alter their lower critical temperature.
Question reproduced from IBO 2018, Theoretical Paper 2, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)