Exam 20: Communities and Ecosystems

Approximately what percentage of the visible light that reaches Earth's producers is converted to chemical energy?

Most decomposers are ________.

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

Use the following information to answer the following questions. Malaria is an infectious disease caused by a unicellular eukaryotic organism belonging to the genus Plasmodium. These eukaryotic organisms are transmitted from one person to another by the female Anopheles mosquito when it feeds on human blood. Within humans, the Plasmodium species destroy red blood cells and, without effective treatment, serious infections can lead to death. Currently, more than 400 million people are afflicted with malaria and between 1 and 3 million people die from it each year. Historically, a chemical compound called quinine has been used in developing effective drugs against malaria. In its natural environment, quinine is produced by certain trees native to South America. This chemical is synthesized in the outer layer of tree trunks and acts as an herbivore deterrent. -Based on the relationship between Plasmodium spp.and humans,Plasmodium would be considered ________.

What is one way in which energy flow differs from chemical cycling?

Landscape ecology ________.

Please refer to the following art to answer the following questions. -Refer to the accompanying figure.All of the living components of the coral reef represent a(n)________.

Several years ago,I was crossing the border from Canada to the United States and I had a bag of Washington State apples with me.The customs officer at the border would not let me take the apples with me into the United States (and I really hated the idea of getting rid of a bag of perfectly good apples).Why did the customs officer refuse to allow me to cross the border with my apples?

Which of these organisms convert atmospheric nitrogen gas to a form that can be utilized by plants?

The major abiotic reservoir for phosphorus is ________.

Plants can most readily utilize the ________ form of nitrogen.

Biomass is the total amount of ________ an ecosystem.

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?

In order to assess the species diversity of a community,you would need to know the number of different species present as well as ________.

A regional assemblage of interacting ecosystems is a ________.

Movement corridors are ________.

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

The atmosphere is approximately 80% ________ gas.

Which type of ecosystem has low primary production but nonetheless contributes a large proportion of Earth's total net primary production?

Refer to the following figure.If there were an additional trophic level that consisted of organisms that prey on snakes,about how much energy would be available to organisms at that trophic level?