Which of the following is true about the length of food chains?a. Food chains can support up to 10 trophic levels.b. Food chains are shorter in stable habitats.c. Energy lost as heat at each trophic level limits the length of food chains.O d. The extinction of a species in a food chain will affect only the species directly preying upon it.e. An ecosystem with a high-enough number of species will feature a limitless length of food chain.

A food chain is a linear network of links in a food web starting from producer organisms and ending…

Which of the following is true about the length of food chains? a. Food chains can support up to 10 trophic levels. b. Food chains are shorter in stable habitats. O C. Energy lost as heat at each trophic level limits the length of food chains. d. The extinction of a species in a food chain will affect only the species directly preying upon it. e. An ecosystem with a high-enough number of species will feature a limitless length of food chain.

Which of the following is true about the length of food chains? a. Food chains can support up to 10 trophic levels. b. Food chains are shorter in stable habitats. O C. Energy lost as heat at each trophic level limits the length of food chains. d. The extinction of a species in a food chain will affect only the species directly preying upon it. e. An ecosystem with a high-enough number of species will feature a limitless length of food chain.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter54: Ecosystems And Global Change

Section: Chapter Questions

Problem 1TYK

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The number of carnivores found at the top of an ecological pyramid is limited by thea. number of organisms above the top carnivores.b. number of trophic levels below the producers.c. biomass of the decomposers.d. amount of energy transferred to the top carnivores.
List two ways in which you could apply these concepts : (a) “as energy flows through ecosystems in food chains and webs, the amount of chemical energy available to organisms at each succeeding feeding level decreases” and (b) “matter, in the form of nutrients, cycles within and among ecosystems and the biosphere, and human activities are altering these chemical cycles.” to making your lifestyle more environmentally sustainable.
a) Each trophic level, on average, will move 10% of the energy tied up in molecules to the next trophic level. How much of the energy from the sun is actually brought in to the first trophic level? b) When the producers convert energy and tie it up in the first trophic level, it is brought in as heat. True or false? c) Which of the following are true about ecosystems? Check all that apply. They contain both living and nonliving components.They contain both living and nonliving components. There is a transfer of energy through the system and some energy is lost as heat energy.There is a transfer of energy through the system and some energy is lost as heat energy. Nutrients repeatedly cycle through the ecosystem.Nutrients repeatedly cycle through the ecosystem. They represent the lowest level of biological organization.They represent the lowest level of biological organization. The ultimate source of energy for most ecosystems is organic molecules.
Which of the following is a consequence of biologicalmagnification?(A) Toxic chemicals in the environment pose greater risk totop-level predators than to primary consumers.(B) Populations of top-level predators are generally smallerthan populations of primary consumers.(C) The biomass of producers in an ecosystem is generallyhigher than the biomass of primary consumers.(D) Only a small portion of the energy captured by producersis transferred to consumers.
EcosystemA hasprimary production of 1000 g C /m2/yr and ecological efficiency of 10%. Ecosystem B has primary production of 300 g C /m2/yr and an ecological efficiency of 25%. a.Which ecosystem will have more production at thesecondary consumer (carnivore) trophic level? b.Which ecosystem is more likely to support an endothermic primary consumer (herbivore)? c.If atrophic level requires at least 1 gC/m2/yr in order to exist, how many trophic levels can each of these ecosystems support?d.Given your answer to part c, which do you thinkhas a larger impact on the energy available at upper trophic levels: primary productivity or efficiency of energy movement across trophic levels?
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DRAW IT In the Chesapeake Bay estuary, the blue crab is anomnivore that eats eelgrass and other primary producers as wellas clams. It is also a cannibal. In turn, the crabs are eaten byhumans and by the endangered Kemp’s Ridley sea turtle. Basedon this information, draw a food web that includes the bluecrab. Assuming that the top-down model holds for this system,describe what would happen to the abundance of eelgrass ifhumans stopped eating blue crabs.
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