Exam 55: Ecosystems and Restoration Ecology

A 3-hectare lake in the American Midwest suddenly has succumbed to an algal bloom.What is the likely cause of eutrophication in freshwater ecosystems,such as this one?

Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem?

Which of the following properly links the nutrient to its reservoir?

How does inefficient transfer of energy among trophic levels result in the typically high endangerment status of many top-level predators?

The major role of detrivores in ecosystems is to

Which of the following pairs is incorrectly matched?

In the nitrogen cycle,the bacteria that replenish the atmosphere with N₂ are

What percentage of solar radiation striking a plant is converted into chemical energy?

For most terrestrial ecosystems,pyramids of numbers,biomass,and energy are essentially the same-they have a broad base and a narrow top.The primary reason for this pattern is that

Which of the following terms encompasses all of the others?

A porcupine eats 3000 J of plant material.Of this,2100 J is indigestible and is eliminated as feces,800 J are used in cellular respiration,and 100 J are used for growth and reproduction.What is the approximate production efficiency of this animal?

Nitrifying bacteria participate in the nitrogen cycle mainly by

Which of the following is an example of an ecosystem?

If you applied a fungicide to a cornfield,what would you expect to happen to the rate of decomposition and net ecosystem production (NEP)?

In a typical grassland community,which of the following has the smallest biomass?

The amount of chemical energy in consumers' food that is converted to their own new biomass during a given time period is known as which of the following?

Which of the following is an example of a local biogeochemical cycle?

Which of the following locations is the reservoir for carbon for the carbon cycle?

The rate at which nutrients move through an ecosystem is most often limited by

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