Exam 55: Energy Flow and Chemical Cycling in Ecosystems

Use the following figure to answer the question. After looking at the evidence from the experiment in the figure, which of the following is the most accurate conclusion about productivity in marine ecosystems?

The flow of energy in an example arctic ecosystem goes through a simple food chain as depicted below: Phytoplankton → zooplankton → fish → seals → polar bears Which of the following is the most accurate conclusion when considering the energetics in this food chain?

Which of the following is a reason that inefficient transfer of energy among trophic levels results in the typically high endangerment status of many top-level predators?

If a pristine river valley was converted to a gravel mine, altering the stream channel and also impacting the associated aquatic and terrestrial biota, which of the following would most likely be the first step to restoring the former river valley ecosystem?

Which statement best describes what ultimately happens to the chemical energy that is consumed but not used to produce new biomass in the process of energy transfer between trophic levels in an ecosystem?

Which of the following organisms is correctly paired with a trophic level?

Which of the following components is not recycled within an ecosystem?

Use the following figure to answer the question. Food web for a particular terrestrial ecosystem (arrows represent energy flow and numbers represent species) Which species in the food web most likely represents a primary producer?

Consider the food chain of grass → grasshopper → mouse → snake → hawk. About how much of the chemical energy fixed by photosynthesis of the grass (100 percent) is available to the hawk, assuming a 10% trophic efficiency?

Which of the following was a result of the Hubbard Brook watershed deforestation experiment?

Which of the following terms encompasses all of the others?

Which of the following best represents the goal of restoration ecology?

Why is it that satellites, using wavelength reflectance technology, detect variable levels of productivity across latitudes in the Earth's oceans, rather than an increase approaching the equator?

The amount of energy from light (or chemicals, in chemoautotrophic systems) converted to the chemical energy of organic molecules per unit time is defined as ________.

The introduction of a predator population of arctic foxes to a small island caused the grassland community of the island to slowly convert to tundra due to changes in nutrient cycling. Which of the following best explains this change in the ecosystem?

Which of these ecosystems has the lowest net primary production per square meter?

Use the figure to answer the question: Which of the following best explains why no arrows lead directly from "Detritus" to secondary consumers?

Which of the following best represents the actions of photoautotrophs?

The discipline that applies ecological principles to returning degraded ecosystems to a more natural state is known as ________.

Use the following figure to answer the question. Which terrestrial habitat type in the figure makes available the most net biomass tissue per unit area available for consumers?