Lecture 21: Thermal Relations

Question 1

1. What combination of terms best describe a dog?
   A. Regulator, poikilothermic, ectothermic
   B. Conformer, homeothermic, endothermic
   C. Regulator, homeothermic, & endothermic
   D. Conformer, poikilothermic, ectothermic

Question 2

2. What term describes the body’s automatic tendency to maintain a constant and optimal internal environment?
   A. Homeostasis
   B. Balanced equilibrium
   C. Static equilibrium
   D. Evaporative cooling

Answer 2

A. Homeostasis

Question 3

3. Evaporative cooling can help lower the temperature
   of plants by up to 10°C and is a result of:
   A. Keeping stomata closed
   B. Photosynthesis
   C. Transpiration
   D. Abscisic acid

Answer 3

C. Transpiration

Question 4

4. What is a widening of superficial blood vessels?
   A. Acclimation
   B. Vasodilation
   C. Countercurrent exchange
   D. Vasoconstriction

Answer 4

B. Vasodilation

Question 5

5. Animals that are endothermic are likely to be at the
   greatest disadvantage in which environment?
   A. Very cold environments
   B. Very hot environments
   C. Environments with a constant food source
   D. Environments with variable and limited food sources

Answer 5

A. Very cold environments