Exam 20: Communities and Ecosystems

An example of a mutualism, or +/+ relationship, is ________.

Which of these organisms convert organic matter to inorganic matter by breaking down dead organisms?

Small areas that have a large number of endangered and threatened species are referred to as ________.

In the food chain grass → antelope → human → lion, the antelope is ________.

Plants can most readily utilize the ________ form of nitrogen.

Two lakes have the same number of species. Most of the fish in Lake 1 are of a single species, with a few individuals each for the remaining species. Lake 2, on the other hand, has about equal numbers of each species. Which lake has higher species diversity?

The major abiotic reservoir for phosphorus is ________.

In the food chain grass → antelope → human → lion, the human is a ________.

What is the range of actual efficiencies of energy transfer from one trophic level to the next?

Modern conservation science increasingly aims at ________.

The figure below shows the growth curves of two populations of Paramecium, P. aurelia and P. caudatum. From the data, we can conclude that ________.

Besides the atmosphere, abiotic reservoirs of carbon dioxide include ________.

Species found in only one place on Earth are called ________ species.

With regard to nutrient pollution in aquatic ecosystems, when is the worst time to apply fertilizer to your lawn?

-In the ecosystem shown, a toxin that accumulates in body tissues would have the largest effect on ________.

A regional assemblage of interacting ecosystems is a ________.

Herbivory is an example of a ________ interaction.

-Examine the figure. Zooplankton feed on phytoplankton that are contaminated by PCBs in the water. Which comparison correctly describes the concentration of PCBs in different trophic levels?

Why might one savanna ecosystem have 4 trophic levels, while a second one has 5?

Why is it important to reverse the decline of endangered species such as the Tasmanian devil?