Chapter 21 Test Review

Which of the following correctly describes the levels of organization discussed in class?

• organism → population → community → ecosystem → biosphere
• population → organism → community → ecosystem → biosphere
• organism → population → ecosystem → community → biosphere
• biosphere → population → ecosystem → community → organism

Groups of the same species living in the same area at the same time are referred to as a(n)

• organism.
• population.
• community.
• ecosystem.

All the populations of different species that live in the same area at the same time are referred to as a(n)

• organism.
• population.
• community.
• ecosystem.

All groups of organisms that live in an area at one time, as well as the climate, soil, water, and other nonliving parts of the environment.

• organism.
• population.
• community.
• ecosystem.

Which is a population?

• all meerkats in a refuge
• all the types of birds in the forest
• all the types of insects in a swamp

Which of the following is an abiotic factor of an ecosystem?

• 
• 
• 
• 

Which of the following is a biotic factor of an ecosystem?

• 
• 
• 
• 

What does this figure represent?

• community
• niche
• organism
• species

What is the chlorophyll density of the southwest area of the United States?

• There is a very dense concentration of chlorophyll in the southwest area of the United States.
• There is little density of chlorophyll density in the southwest area of the United States.
• There is no way to tell the concentration of chlorophyll in any area of the United States.

The need for organisms to rely on the same resources causes

• biotic potential.
• huddling together to stay warm.
• competition.
• teaching young to search for food.