Practice Test Answers

What is the primary source of energy for food chains in an ecosystem?

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?

Water exits the leaves of plants and enters the atmosphere. What is this process called?

How do limiting factors most affect population size?

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?

Which of these could result in secondary succession?

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

If a deer eats grass, what percentage of energy will the deer acquire from the grass?

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

Which graph best represents the relationship between niche diversity and biodiversity?

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

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?

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

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

A conservation biologist has determined the status of the ecosystems in a protected area, as shown in the table. Based on the table, which part of the pie chart represents secondary succession? Status of ecosystems Percentage of protected area Primary succession 10 Secondary succession 30 Barren land 5 Established community 55