Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which best exemplifies ectothermy?

a. The metabolic rate increases as the temperature decreases.

b. Body temperature remains constant when environmentaltemperatures change.

c. Food demand increases when temperatures drop.

d. Virtually all invertebrate groups are ectotherms.

e. No vertebrate groups are ectotherms.

Summary Introduction


Ectotherms are a group of organisms in which the internal body mechanisms are not capable enough in regulating the temperature of the body. Such organisms depend upon the environmental sources of heat, which allows them to function at a very efficient metabolic pace.


Justification for the correct answer:

Option (d) is that virtually all invertebrates groups are ectotherms. This is a true statement as all invertebrates (fishes, lizards, amphibians, snakes, and others) are ectotherms. These invertebrates are portrayed as cold-blooded animals, even though the body temperature of some of them may be higher than the humans. The ectotherms control the temperature of the body by managing the heat exchange rate with the surroundings. Hence, the option (c) is correct.

Justification for the incorrect answers:

Option (a) states that the metabolic rate increases as the temperature decreases. This is false as the metabolic rate of an ectotherm characteristically increases as the temperature increases. An ectotherm uses less amount of energy when the temperature is low as compared to the condition when the temperature is high...

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