Which level of the biosphere includes both living and nonliving factors?
ecosystem
You are an ecologist studying a newly discovered animal. You find that it reproduces quickly and has many offspring each time it reproduces. What type of organism is?
an r-strategist
Which graph is an exponential growth model?
Graph A
Which point on the graph represents carrying capacity when full?
Point C
Which items are abiotic factors of an ecosystem?
air, water, and rocks
The Florida Everglades is a unique wetland ecosystem that is constantly undergoing change. What are the main parts of this ecosystem?
all the populations and the surrounding environment
Thousands of species of organisms live in 1 square mile of tropical rain forest. Which statement is true about those organisms?
They are part of the same community.
What is not an example of an ecosystem?
carbon dioxide
The Sonoran Desert is a unique ecosystem in Arizona and Mexico. What are the two main parts of this ecosystem?
the organisms and the abiotic factors
What is a biotic factor in a coral reef ecosystem?
lion fish
If an ecosystem lost a keystone species, which outcome would you expect?
The population numbers of other species would change dramatically.
The Gulf of Mexico provides 72 percent of the shrimp harvested in U.S. waters. Those populations are at risk because of the dead zone in the Gulf of Mexico. Which statement best describes this dead zone?
It is a zone of ocean water that has almost no oxygen.
How did the Gulf of Mexico's dead zone form?
Fertilizer runoff from farming caused populations of algae to grow exponentially.
Which phrase best defines a biome?
a large area dominated by specific kinds of organisms
In which biome would you find organisms adapted to infrequent rain?
desert
Which biome does this photograph represent? (snowy trees)
Taiga
Which biome does this photograph represent?
desert
Which biome covers the largest part of earth's surface?
marine
Why did the removal of wolves from northern Wisconsin change the makeup of the plants in the forest?
Wolves are predators of deer, and without wolves, more deer survived and ate more forest plants.
What is one difference scientists noticed in parts of Zion National Park that had higher species diversity compared with regions with lower species diversity?
Areas with lower diversity had higher rates of erosion.
Choose the sentence that best explains the statement, "Tropical rain forests have the highest biodiversity of any place on earth."
Tropical rain forests have more species of organisms than any other place on earth.
Which trophic level has the least amount of energy available for the next highest trophic level?
secondary consumer
If you wanted to add decomposers to a diagram of an energy pyramid that contains producers, and primary and secondary consumers, which trophic level(s) would be affected?
all trophic levels
Which statement best explains why the stability of the producer population is important to the stability of the entire ecosystem?
Producers are responsible for providing energy to the rest of the ecosystem.
In the arctic energy pyramid, which trophic level has the least amount of energy available to it?
tertiary consumers
The tropical rain forest ecosystem near the Amazon River contains hundreds of food chains. Which term refers to the combination of all food chains within an ecosystem?
food web
Which statement best describes a food chain?
one pathway through which energy moves from one trophic level to the next
