Practice Test

Question 1

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

Revolt · Accepted Answer

A: the sun

Question 2

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?

Revolt · Accepted Answer

A: It is increasing.

Question 3

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

Revolt · Accepted Answer

B: transpiration

Question 4

How do limiting factors most affect population size?

Revolt · Accepted Answer

D: restrict population growth

Question 5

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?

Revolt · Accepted Answer

C: dead bird

Question 6

Which of these could result in secondary succession?

Revolt · Accepted Answer

C: an introduced species that destroys all the native plants in an area

Question 7

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

Revolt · Accepted Answer

A: commensalism.

Question 8

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

Revolt · Accepted Answer

A: 10  percent

Question 9

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

Revolt · Accepted Answer

B: Many kinds of fruit trees support a variety of birds and other animals in a forest.

Question 10

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

Revolt · Accepted Answer

A: Image with description A graph. The y-axis is labeled sustainability and the x-axis is labeled increasing biodiversity. It plots an increasing slope that starts from the origin.

Practice Test Answers

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