Unit Test Answers

How are the carbon, nitrogen, and oxygen cycles similar?a.They are all biogeochemical cycles.b.They all involve an interaction between living and nonliving elements.c.They are all part of the Earth system.d.All of the above.

What is the main advantage to using satellites to measure climate change?a.They can measure aspects of climate globally.b.They are unaffected by the weather conditions they measure.c.They are a universal tool for measuring all factors of climate.d.They can measure the amount of rainfall a specific area receives.

Which of the following statements about positive feedback mechanisms is not true?a.Positive feedback mechanisms can result from human activity.b.Positive feedback mechanisms can occur naturally.c.Positive feedback mechanisms lead to increased change.d.Positive feedback mechanisms reduce change in a system.

The biosphere is the only one of Earth’s systems that contains life.

Which is an example of biodiversity contributing to the sustainability of an ecosystem?

Which describes a disruption in the water cycle that could affect photosynthesis?

Humans affect the carbon cycle in many ways through the use of fossil fuels, clear cutting of forests, and controlled burns. Which process can help counteract these human interactions?

A conservation biologist has determined the status of the ecosystems in a protected area, as shown in the table below. Based on the table, which part of the pie chart represents secondary succession?Status of ecosystemsPercentage of protected areaPrimary succession10Secondary succession30Barren land5Established community55

How does conservation affect biodiversity?

Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen- and phosphorus-enhanced fertilizers?

Which of the following could result in secondary succession?

Explain why humans cannot impact one of Earth’s systems without impacting the others.

What system includes oxygen, nitrogen, and ozone? a.geosphereb.hydrospherec.atmosphered.biosphere

How could the loss of biodiversity affect humans?

A large manufacturing company releases chemicals into the air every day. The chemicals eventually make their way into local bodies of water, killing many of the organisms that live in these areas.