Answers Biology B CREDITS 5Human Impact on the Environment

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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

Population growth is decreasing.

Population growth is increasing.

Population growth stays the same.

Population reaches carrying capacity.

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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?

100

128

256

320

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?

density-independent factors

density-dependent factors

population-dependent factors

population-independent factors

Both photosynthesis and cellular respiration are part of the carbon cycle. Which statement best compares these two processes?

Both release carbon dioxide as waste.

Both provide organisms with usable energy.

Both add bacteria to the soil.

Both require fixation in order to convert molecules.

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?

Females do not have to compete for a mate.

Male offspring can belong to more than one social group.

Adult males can mate with females in several different social groups.

Females are the only ones responsible for taking care of the offspring.

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?

The ash borer is a density-independent limiting factor, and humans need to clear cut to control tree density.

The ash borer is a density-dependent limiting factor and will start to spread to nearby healthy trees.

Ash trees are outcompeting other trees and are thus more affected by the ash borer.

Changes in climate have decreased ash borer populations which indirectly increased the need for cutting down the trees.

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?

100

128

256

320

density-independent factors

density-dependent factors

population-dependent factors

population-independent factors

What would most likely happen if there were no condensation stage in the water cycle?

Water could not convert from a gas to a liquid.

Water could not convert from a liquid to a gas.

Water could not convert from transpiration to evaporation.

Water could not convert from precipitation to evaporation.

Termites are insects that live in colonies. In a colony, the king and a queen are responsible for reproduction. Workers spend most of their time caring for the other termites and building the nest. Soldiers protect the nest from attacks.The organization of the termite colony is an example of which benefit of social behavior?

foraging

protection

reproduction

division of labor

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?

The ash borer is a density-independent limiting factor, and humans need to clear cut to control tree density.

The ash borer is a density-dependent limiting factor and will start to spread to nearby healthy trees.

Ash trees are outcompeting other trees and are thus more affected by the ash borer.

Changes in climate have decreased ash borer populations which indirectly increased the need for cutting down the trees.

Which determines carrying capacity?

logistic factors

exponential growth

population growth

limiting factors

Both photosynthesis and cellular respiration are part of the carbon cycle. Which statement best compares these two processes?

Both release carbon dioxide as waste.

Both provide organisms with usable energy.

Both add bacteria to the soil.

Both require fixation in order to convert molecules.

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

shrubs

lichen

small annual plants

pine and oak trees

Which statement describes the relationship between plants, animals, and the carbon cycle?

Plants use carbon and release oxygen, and animals release carbon and use oxygen.

Animals fix carbon and release oxygen, and plants release carbon and use oxygen.

Animals fix carbon through respiration, and plants fix carbon through photosynthesis.

Plants use carbon when they decompose, and animals release carbon when they decompose.

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

It would decrease.

It would increase.

It would die off.

It would remain the same.

Which statement describes both a positive impact and a negative impact associated with the effects of nitrogen-enhanced fertilizers?

They increase polluted runoff and damage drinking water.

They increase plant growth and damage drinking water.

They increase denitrifying bacteria and increase plant growth.

They increase both limiting resources and denitrifying bacteria.

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?

by increasing carbon dioxide and decreasing oxygen

by increasing carbon dioxide and increasing oxygen

by decreasing carbon dioxide and increasing oxygen

by decreasing carbon dioxideand decreasing oxygen

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

A change occurred in the genetic variability.

The deer population experienced a rapid decline due to a parasite.

Mountain lion hunting experienced an increase in restrictions.

The population of Trichinella, a parasite, experienced a decline.

Which statement describes the relationship between plants, animals, and the carbon cycle?

Plants use carbon and release oxygen, and animals release carbon and use oxygen.

Animals fix carbon and release oxygen, and plants release carbon and use oxygen.

Animals fix carbon through respiration, and plants fix carbon through photosynthesis.

Plants use carbon when they decompose, and animals release carbon when they decompose.

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

Using bamboo results in an increased use of forest trees.

Practicing contour plowing results in a need for more land.

Setting irrigation systems to run longer results in a reduction of water use.

Building more wind farms results in a reduction of fossil fuel use.

Females do not have to compete for a mate.

Male offspring can belong to more than one social group.

Adult males can mate with females in several different social groups.

Females are the only ones responsible for taking care of the offspring.

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

primary succession after a controlled fire

primary succession after a volcanic eruption

secondary succession after a controlled fire

secondary succession after a volcanic eruption

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?

Wild boars were brought to the United States by humans.

Wild boars have quickly spread through the United States.

Wild boars have established successfully mostly in areas with warm climates.

Wild boars have a high reproductive rate and no natural predators.

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?

Lion and cheetah populations compete for the food source of zebras, and lions outcompete cheetahs.

The dwindling zebra population has led to the decline of the predator lion and cheetah populations.

Overhunting of lion and cheetah populations has led to a decline in the food source population.

Lion and cheetah populations compete for the food source of zebras, and cheetahs outcompete lions.

Which statement best compares consumers and decomposers?

Both get their energy by feeding on other organisms.

Both get their energy by photosynthesizing.

Consumers feed on other organisms, and decomposers make their own food.

Consumers make their own food, and decomposers feed on other organisms.

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?

the National Park System Act

the Lacey Act

EPA

CITES

Which of these is an autotroph?

consumer

producer

carnivore

herbivore

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?

4 deaths, 7 births, 2 immigration, 6 emigration

3 deaths, 6 births, 5 immigration, 7 emigration

5 deaths, 2 births, 8 immigration, 3 emigration

1 deaths, 5 births, 3 immigration, 7 emigration

Population growth is decreasing.

Population growth is increasing.

Population growth stays the same.

Population reaches carrying capacity.

The image shows a group of fish.

herding

dividing labor

schooling

flocking

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?

produce brought from the eastern states

trapped in a ship's ballast or a water tank

trapped in a cargo crate carrying nonperishable items

luggage brought in an overseas flight

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

rice cultivation and water vapor

landfilling and carbon dioxide

deforestation and methane

sewage treatment and nitrous oxide

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

migrating

herding

schooling

cooperative hunting

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