Question 19
HomeostasisThe graph in Fig. 1 shows the results of a laboratory investigation which measured the body temperatures of a lizard and a bird under changing artificial conditions.
Which of the statements below is valid?
- A.The bird's blood was always warmer than that of the lizard
- B.The body temperature of the bird varied less than that of the lizard during changes in environmental temperature
- C.The body temperature of the bird remained constant despite changes in environmental temperature
- D.The body temperature of the lizard was always close to that of the environmental temperature
Show the answer and explanation
Answer: B (The body temperature of the bird varied less than that of the lizard during changes in environmental temperature)
Explanation
On the graph the lizard's temperature climbs steeply from about 60°F to above 110°F, while the bird's line rises only a few degrees. So the bird's temperature varied less, but it did not stay exactly constant, and the lizard was warmer than the bird at high temperatures.