Unit Test — Unit test Answers

Consider the following data. Rates for Cheetah Population from 2011 to 2012Cause of change20112012Deaths21Births54Immigration 61Emigration83Which would have to happen to keep the population growth of cheetahs in 2013 the same the previous years?

The image shows a group of fish.

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

A group of sheep run in random directions to confuse a single predator. This is an example of which social behavior?

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

Which determines carrying capacity?

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?

best

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?

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?

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?

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?

Which statement best compares consumers and decomposers?

Review the chart, which shows the population sizes of three African animals in 1990 and in 2000. Population Estimates of Animals in Africa in 1990 and in 2000 19902000Lions100,00047,000Cheetahs25,0007,500Zebras750,000450,000Which explanation is best supported by the numbers in the chart?

Which of these is an autotroph?

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

Some species form social groups only with members of the same gender. For example, elephants form groups with only females and their offspring. Once the male offspring reach a certain age, they leave the group and become solitary.Which is a benefit of this type of social group structure?

most

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

Ground squirrels are found in many areas of the United States. They live in underground burrows and are often attacked by birds of prey, coyotes, and bobcats. Which of the following is a limiting factor for a ground squirrel population?