AnswersFA Vandergrift Environmental Science 2026-27Cumulative Exam

Cumulative Exam — Cumulative exam Answers

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1
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The traditional view of mangrove forests as wastelands and unhealthy environments helped promote their degradation because _______.

A
mangrove forests are unproductive, unhealthy habitats
B
people did not feel it was necessary to preserve them
C
mangrove forests do not need to be preserved
D
all of the above
2
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Which is a requirement for natural selection to occur?

A
heritable variations for some traits
B
the ability of an organism to improve a trait during its lifetime
C
equal probability of survival for all offspring
D
fewer offspring than the environment can support
3

Yellowstone National Park has an average of about 4500 bison living in it. The park covers 3472 square miles. What is the population density of bison living in Yellowstone?

Question illustration
A
1.3 bison/mi
B
16 bison/mi
C
77 bison/mi
D
0.77 bison/mi
4

Scientists use specific levels of organization to analyze the biosphere. Which level of organization describes a school of anchovies? School of Anchovies

Question illustration
A
ecosystem
B
community
C
population
D
biome
5

Which biomes receive less than 100 cm of rain each year? Select three options.tropical rain foresttemperate rain forestdeserttundragrassland

A
tropical rain forest
B
temperate rain forest
C
desert
D
tundra
E
grassland
6

Which of the following is not a trait of mangrove trees?

A
They excrete salt through their leaves.
B
They do not tolerate highly saline environments.
C
They have two types of specialized roots.
D
They absorb oxygen through their roots.
7

Changes to the global climate could include _______.

A
changes to temperature
B
changes to pressure
C
changes to precipitation
D
all of the above
8

Which of the following is true of coral?

A
It is located in deep sea regions.
B
It supports few species.
C
It is composed of a single large and complex coral organism.
D
It is composed of thousands of individual coral organisms.
9

Fluctuations in the phosphorus cycle in aquatic ecosystems _______.

A
can lead to changes in the growth rates of aquatic populations
B
are never caused by human impact on the environment
C
lead to a decrease in the amount of phosphorus found in sediment
D
never occur naturally
10

All wetlands are considered freshwater ecosystems.

A
T
B
F
11

A balance in abiotic factors is vital to healthy ecosystems.

A
T
B
F
12

Ground squirrels inhabit African savannas. Which adaptation helps the ground squirrels live in this biome?

A
tan coloring to blend in with the surroundings
B
thick fur to conserve heat
C
sharp claws for climbing trees
D
white coloring to blend in with the surroundings
13

Which is a limiting nutrient for plant growth?

A
water
B
nitrogen
C
carbon
D
oxygen
14

Which of the following about the ozone layer is not true?

A
The ozone layer is formed in the stratosphere.
B
The ozone layer helps sustain life by absorbing a large amount of incoming UV radiation.
C
Ozone in the troposphere is beneficial to living organisms.
D
Depletion of the ozone layer can lead to an increase in skin cancer.
15

Pollution in the _______ will have the greatest effect on human health.

A
troposphere
B
stratosphere
C
mesosphere
D
thermosphere
16

How can an increase in biodiversity lead to an increase in ecosystem stability?

A
A more biodiverse ecosystem is not subject to change.
B
A more biodiverse ecosystem has a higher chance of adapting to species changes.
C
A more biodiverse ecosystem has fewer species types to balance.
D
A more biodiverse ecosystem is subject to fewer natural disasters.
17

Which of the following statements about biodiversity is true?

A
Changes to biodiversity always positively affect an ecosystem.
B
Changes to biodiversity always negatively affect an ecosystem.
C
Changes to biodiversity can positively and negatively affect an ecosystem.
D
Changes to biodiversity never affect an ecosystem.
18

Which of the following is not a way in which wetlands filter water?

A
nutrient absorption
B
oil absorption
C
sediment trapping
D
bacterial absorption
19

Which of the following statements about wetlands is not true?

A
There is more than one type of wetland.
B
Wetlands can contain either freshwater or saltwater.
C
Wetlands exist in a small range of climates.
D
Wetlands support a variety of organisms.
20

R-selected species have a short life span and an early reproduction cycle.

A
T
B
F

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