Unit Test Answers

The map shows the distribution of wild boars in the United States (shaded area). Which of these facts about wild boars is best supported by the evidence provided?

Which best describes what is occurring in this population of squirrels?Number of Squirrels Entering and Leaving a Population after 1 YearCause of changeNumber of squirrelsDied from predation2Born4Immigration10Left to find food3Died from disease8Left to find a mate3

Which best describes how an organism’s niche is determined?

Wolves are predators of deer. What is most likely to happen to the deer population if the wolf population increased?

A mountain lion population recently experienced a drop in population size. Which of the following would best describe the limiting factor that is involved?

Review the picture below.Which would be the most accurate title for this picture?

Which molecule would be the most affected by limited nitrogen?

The burrowing owl is found in dry, open areas such as grasslands, prairies, savannas, deserts, farmlands, golf courses, and urban areas throughout most of western United States and Florida, Central America, and most of South America. It makes its home in burrows of other animals and primarily eats insects and small rodents. As humans build more cities, nearby burrowing owl habitats change due to destruction of burrows and loss of prey. Which is the least likely outcome of the habitat changes that are described?

Which statement best compares consumers and decomposers?

Which describes a way in which phosphorus may enter into the phosphorus cycle?

Ash trees are being removed when they show signs of the ash borer, a parasite that affects only ash trees and kills them off. What best explains why the ash trees are being cut down?

Rainforests around the world are being cleared at an alarming rate to make room for new communities, agriculture, mining, and roads, and to provide lumber for construction and furniture. How might the destruction of rainforests affect the balance of gases in Earth's atmosphere?

Which sustainable practice is paired correctly with its impact on the environment?

If the herbivore population in an ecosystem increased, what would most likely happen to the size of the carnivore population?

What kind of display would be the best way to represent the data below?Type of speciesCritically endangered (%)Endangered or vulnerable (%)Plants1370Invertebrates035Freshwater fish937Amphibians730Reptiles528Birds012Mammals221

A trout population grew from 4 in 1992 to 16 in 1993 and then to 64 in 1994. If it continued to grow exponentially, approximately how many trout were there in 1995?

How would an increase in nest sites affect a population of pigeons?

Which determines carrying capacity?

An ecosystem has experienced a flood. Which type of plants would you expect to see growing first after the flood?

The Serengeti plains are part of the African savanna ecosystem and are home to a variety of different species of plants and animals. The Serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. Which type of limiting factors does the seasonal drought in the Serengeti plains affect?

What best describes the association between the carbon cycle, plants, and animals?

A hunter illegally kills a wolf in Yellowstone National Park and attempts to bring the wolf's skull back to Florida. Which law is the hunter violating?

Grass starts with 30,000 kcal of energy. A cheetah would acquire kcal of energy after it ate a zebra that had consumed the grass.

Which human activity is correctly paired with the greenhouse gas that it increases?

White perch is a fish that is native to Atlantic coastal regions and is invasive to the Great Lakes. It feeds on native species and is thought to be the cause of the decline of the Great Lakes walleye fish populations. What was most likely its mode of introduction?