AnswersCO-Biology B-CRUnit Test

Unit Test — Unit test Answers

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

A
The population would decrease.
B
The population would increase.
C
The population would remain almost the same.
D
The population would be reduced the next year.
2
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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?

A
by increasing carbon dioxide and decreasing oxygen
B
by increasing carbon dioxide and increasing oxygen
C
by decreasing carbon dioxide and increasing oxygen
D
by decreasing carbon dioxideand decreasing oxygen
3

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?

Question illustration
A
Wild boars were brought to the United States by humans.
B
Wild boars have quickly spread through the United States.
C
Wild boars have established successfully mostly in areas with warm climates.
D
Wild boars have a high reproductive rate and no natural predators.
4

Which organism obtains its energy exclusively from dead or decaying matter?

A
groundhog
B
bacteria
C
daisy
D
human
5

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?

A
Lion and cheetah populations compete for the food source of zebras, and lions outcompete cheetahs.
B
The dwindling zebra population has led to the decline of the predator lion and cheetah populations.
C
Overhunting of lion and cheetah populations has led to a decline in the food source population.
D
Lion and cheetah populations compete for the food source of zebras, and cheetahs outcompete lions.
6

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?

A
4 deaths, 7 births, 2 immigration, 6 emigration
B
3 deaths, 6 births, 5 immigration, 7 emigration
C
5 deaths, 2 births, 8 immigration, 3 emigration
D
1 deaths, 5 births, 3 immigration, 7 emigration
7

A grass starts with 30,000 kJ of energy. How much energy would a cheetah acquire after it ate a zebra that consumed the grass?

A
30 kJ
B
300 kJ
C
3,000 kJ
D
30,000 kJ
8

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

A
Plants fix carbon and release oxygen, and animals release carbon and use oxygen.
B
Animals fix carbon and release oxygen, and plants release carbon and use oxygen.
C
Animals fix carbon through respiration, and plants fix carbon through photosynthesis.
D
Plants decompose fixing carbon, and animals decompose releasing carbon.
9

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?

A
The niche of the burrowing owl may change as it adapts to the changes.
B
The niche of the burrowing owl may change as it moves to a new habitat.
C
The population of the burrowing owl may be reduced or even become extinct.
D
The population of the burrowing owl may increase in its new surroundings.
10

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

A
shrubs
B
lichen
C
small annual plants
D
pine and oak trees
11

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?

A
100
B
128
C
256
D
320
12

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

A
Earthquakes release phosphorus.
B
Phosphorus is carried in the rain that was evaporated from lakes.
C
Human use of fertilizers release phosphorus into the groundwater.
D
Phosphorus is transpired from the leaves of plants.
13

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
The ash borer is a density-independent limiting factor, and humans need to clear cut to control tree density.
B
The ash borer is a density-dependent limiting factor and will start to spread to nearby healthy trees.
C
Ash trees are outcompeting other trees and are thus more affected by the ash borer.
D
Changes in climate have decreased ash borer populations which indirectly increased the need for cutting down the trees.
14

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

A
rice cultivation and water vapor
B
landfilling and carbon dioxide
C
deforestation and methane
D
sewage treatment and nitrous oxide
15

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

Question illustration
A
primary succession after a controlled fire
B
primary succession after a volcanic eruption
C
secondary succession after a controlled fire
D
secondary succession after a volcanic eruption
16

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?

A
a population of tree squirrels
B
a population of hawks
C
genetic variability
D
breeding season
17

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?

A
produce brought from the eastern states
B
trapped in a ship's ballast or a water tank
C
trapped in a cargo crate carrying nonperishable items
D
luggage brought in an overseas flight
18

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

A
An organism's habitat and inherited traits determine its niche by influencing how it interacts with the environment and other organisms.
B
An organism’s reproductive rate and population size determine its niche in an ecosystem.
C
An organism's physical size and strength determine its niche by helping it dominate other species.
D
An organism's location and prey determine its nice, regardless of its behaviors or traits.
19

What would happen to the size of the carnivore population if the herbivore population increased?

A
decrease
B
increase
C
die off
D
stay the same
20

Which molecule would be the most affected by limited nitrogen?

A
myofibrillar proteins in muscle
B
glucose molecules in starch
C
fat molecules surrounding organs
D
cellulose molecules in plant cell walls

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