Chapter 13 Review

A group of organisms of the same species that live in the same area is called a(n)

• community
• population

What does the diagram in Figure 13.1 show?

• the nitrogen cycle
• the carbon cycle

Herbivores are which of the following?

• primary consumers
• producers

Which phrase best describes biodiversity?

• the number of species in an ecosystem
• the amount of biomass in an ecosystem

Which organisms help convert gaseous nitrogen into ammonia in the nitrogen cycle?

• grasses
• bacteria

An ecologist counts weeds to monitor their populations. Which of the following best describes the ecologist’s methods?

• observation
• experimentation

Organisms that feed on dead or decaying matter are called

• detritivores
• carnivores

What do all the biotic and abiotic factors in a given area make up?

• a habitat
• an ecosystem

Which of the following parts of Figure13.2 is an example of a biotic factor?

• deer
• sunlight

Which process is part of the hydrologic cycle?

• evaporation
• ammonification