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