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Biology: The Dynamic Science (Mind...

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

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

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

Endothermic animals exhibit a lower ecological efficiency than ectothermic animals because:

a. endotherms are less successful hunters than ectotherms.

b. endotherms eat more plant material than ectotherms.

c. endotherms are larger than ectotherms.

d. endotherms produce fewer offspring than ectotherms.

e. endotherms use more energy to maintain body temperaturethan ectotherms.

Summary Introduction

Introduction:

In an ecosystem, the transfer of energy decreases from one trophic to the next trophic level. Ecological efficiency is the efficiency with which energy is transferred. It is determined by efficiencies of different processes, like harvesting food, assimilating ingested energy, and production of new biomass.

Explanation

Justification/explanation for the correct answer:

Option (e) states that “endotherms use more energy to maintain body temperature than ectotherms, because of which their ecological efficiency is lower than that of the ectotherms.” This is correct that endothermic animals exhibit lower ecological efficiency than ectothermic animals because endothermic animals use most of their energy to regulate their body temperature and less than 10% (percent) of energy for growth and reproduction, whereas ectothermic animals gain heat from the environment and, thus, use more than 50% of their energy for producing new biomass, thus exhibiting higher ecological efficiency than the endothermic animals. Hence, option (e) is correct.

Explanation for the incorrect answers:

Option (a) states that “endothermic animals exhibit lower ecological efficiency than ectothermic animals because endotherms are less successful hunters than ectotherms.” This is not correct because endothermic animals use most of their energy to regulate their body temperature and less than 10% of their energy for growth and reproduction, due to which they exhibit lower ecological efficiency. So, it is an incorrect option...

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