Succession and Extinction — Unit test Answers

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

Which shows the levels of organizational hierarchy listed from least complex to most complex?

How does conservation affect biodiversity?

A tsunami hits the coast of a heavily populated island. Which effect might occur?

How could the loss of biodiversity affect humans?

Which example is a short-term environmental change?

Which term refers to all areas of Earth where life exists?

Which of the following could result in secondary succession?

Which example is a long-term environmental change?

A biologist is writing a report about a group of rattlesnakes that all live in the state of Florida. All rattlesnakes in this group can breed with one another and produce offspring that can reproduce together. The report includes statistics about the number of these rattlesnakes, their breeding rate, and the ranges of their sizes and other traits. In this report, the biologist is describing

The tundra ecosystem of Alaska is known as a “cold desert.” It receives very little precipitation, about four inches annually. However, it is rich in wetlands due to permafrost, which traps moisture close to the surface. The temperatures vary widely, also producing persistent winds. Although treeless, the Arctic tundra is an abundant ecosystem. Many organisms find their niche here including many migratory bird species and mammals such as caribou, foxes, bears, and small rodents. Which factor of the tundra ecosystem is biotic?

The coyote's diet includes a wide variety of small mammals, livestock, birds, reptiles, carrion, fruit, and vegetables. It is one of the few animals that has enlarged its range since human encroachment began. Which is the most likely reason for this?

Which effect is one likely result of a forest fire?

What term includes all the biotic and abiotic factors in an area?

Which best describes the relationship between two species and a niche?