Practice Test Answers

How would a harsh winter most likely affect the rabbit population size?

A population of zebras experienced ten births, six deaths to predation, three deaths to disease, three individuals joining the population, and zero individuals leaving. What is happening to the population growth?

Which statement best describes the purpose of Earth's spheres?

How do limiting factors most affect population size?

Pandas eat bamboo for energy. What are pandas classified as?

Which statement best compares the carbon cycle and the nitrogen cycle?

What is the primary source of energy in a food chain?

Which best describes what happens when an animal does not form a social group?

A relationship in which one organism benefits while the other is neither harmed nor helped is called

Barnacles and whales have a commensalistic relationship in which barnacles benefit. What would most likely happen to the whale population if the barnacle population decreased?

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

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?

What could explain the curve in this population growth graph?

Which description belongs in the area marked "X"?