Chapter 13
Almost all autotrophs get their energy from
Sunlight
A group of gray wolves living in Minnesota is an example of
A Population
Which organisms help convert gaseous nitrogen into ammonia in the nitrogen cycle?
Bacteria
All of the organisms that inhabit the savanna make up a(n)
Biome
What are two processes by which autotrophs make food?
Chemosynthesis and Photosynthesis
Which of the following parts of Figure 13.2 are biotic factors?
Deer, Mushroom, Tree
Which process is part of the hydrologic cycle?
Evaporation
An ecologist counts weeds to monitor their populations. Which of the following best describes the ecologist's methods?
Observation
An ecologist surveys weeds to monitor their populations. Which of the following best describes the ecologist's methods?
Observation
Which of the following can be both primary and secondary consumers?
Omnivors
Which two processes in the carbon cycle are also parts of the oxygen cycle?
Photosynthesis and Respiration
A group of organisms of the same species that live in the same area is called a(n)
Population
Herbivores are which of the following?
Primary Consumers
Which of the following provide most of the energy in ecosystems?
Producers
Which model shows the number of organisms at each trophic level in an ecosystem?
Pyramid of Numbers
A pyramid of numbers is used to show
The distribution of organisms in an ecosystem
Which statement is true of producers?
They provide most of the energy in ecosystems
Which process is part of the hydrologic cycle?
Transpiration
A major regional or global community of organisms is called
A Biome
What is a detritivore?
A decomposer that feeds on dead and decaying matter
Which of the following best describes an ecosystem?
All of the biotic and abiotic factors in a given area
If a keystone species is removed from an ecosystem,
Abiotic and Biotic factors can be affected
What do all the biotic and abiotic factors in a given area make up?
An Ecosystem
Which of the following parts of Figure 13.2 is an example of a biotic factor?
Deer
Organisms that feed on dead or decaying matter are called
Detrivors
Bacteria are important in the nitrogen cycle because they
Help convert nitrogen into a form that organisms can use
An organism that has an unusually large effect on an ecosystem is called a(n)
Keystone Species
What does the diagram in Figure 13.1 show?
The Carbon Cycle
Which phrase best describes biodiversity?
The number of species in an ecosystem