Question

which of the following is true about the efficiency of energy transfer in an ecosystem?
a. the more energy the organism requires, the more efficient the energy transfer.
b. all energy transfers have the same efficiencies.
c. the less energy the organism requires, the more efficient the energy transfer.
d. the most efficient energy transfers are in large, warm - blooded animals.

Explanation:

• Option a: Energy transfer efficiency is not directly related to the amount of energy an organism requires in this simplistic way. Higher - energy - requiring organisms may have complex metabolic processes that don't necessarily mean more efficient transfer.
• Option b: Different organisms and different types of energy transfers (e.g., between trophic levels) have different efficiencies. For example, energy transfer from producers to primary consumers is around 10% - 20% in a typical ecosystem, and this is not the same for all transfers.
• Option c: Organisms that require less energy often have simpler metabolic pathways. For example, some small, cold - blooded organisms (like some insects) have relatively simple energy - use mechanisms. They don't have to maintain a high body temperature (unlike warm - blooded animals), so a larger proportion of the energy they consume can be used for basic life processes (such as growth and reproduction), which implies a relatively more efficient energy transfer in terms of energy use for life - sustaining functions compared to more energy - demanding organisms.
• Option d: Large, warm - blooded animals have high energy requirements to maintain their body temperature. A significant amount of the energy they consume is used for thermoregulation. So, their energy transfer efficiency (in terms of energy used for growth, reproduction etc. relative to total energy intake) is relatively low compared to some less energy - demanding organisms.

Answer:

C. The less energy the organism requires, the more efficient the energy transfer.