AnswersPBCSD_Grade_Forgiveness_2001340_Environmental_Science_S1_2020Unit Test

Unit Test — Unit test Answers

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1
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Which of the following is true concerning hull fouling from commercial shipping and recreational boating?

A
It constitutes less than half of all nonnative species introductions.
B
The revenue brought in from these industries is relatively small.
C
It is difficult to prevent since ship hulls begin, conduct, and end voyages in water.
D
It is best combated by chemical treatments.
2
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While trees are not the largest level in the pyramid of numbers, they are still the base for both the pyramids of biomass and pyramids of energy.

A
T
B
F
3

A quaternary consumer species would be expected to have a smaller population than a secondary consumer species.

A
T
B
F
4

Variation of ecological habitats within a species is characteristic of which type of diversity?

A
Genetic diversity
B
Ecosystem diversity
C
Species diversity
D
Regional diversity
5

It is advantageous for a predator to prey exclusively on a single prey species.

A
T
B
F
6

Why might it be beneficial to regulate what species of plants and animals people are allowed to own in particular environments?

A
Some species might become invasive and destructive if they escaped.
B
Some species may be dangerous to humans.
C
Nonnative plants and animals should only be used for commercial purposes.
D
There is no reason to restrict an individuals’ right to own plants or animals.
7

Rabbits are best described as _______.

A
producers
B
primary consumers
C
secondary consumers
D
tertiary consumers
8

The coyote's diet includes a wide variety of small mammals, livestock, birds, reptiles, carrion, fruit, and vegetables. It is one of the few animals that has enlarged its range since human encroachment began. Which is the most likely reason for this?

A
It has adapted its diet to include more variety, thereby increasing its food supply.
B
It has intermingled with human pets, such as the dog, to increase its population.
C
It has migrated to ranges with more favorable, moderate climates.
D
It has an increase in nest and shelter sites within the urban and rural range.
9

Variations within a species are an important part of Charles Darwin's theory of evolution. Which example can be explained by individual variation?

A
The food source in a lake is not enough to support the bass population, but it can support the trout.
B
A population of brown bears has doubled in the past 10 years as its habitat size has increased.
C
Owls and foxes compete fiercely against each other for small rodents in their habitat.
D
Brightly colored cardinals are better able to survive and to reproduce than darker cardinals.
10

A scientist is studying the Big Bang theory, which is a theory that attempts to explain the creation and early development of the universe. She finds new evidence that suggests this theory might be incorrect. What happens next?

A
More experiments are done to replicate the new findings.
B
The theory is corrected to include the new information.
C
A new hypothesis is developed to address the new findings.
D
The theory is disproved and thrown out.
11

Which is an example of temporal isolation?

A
flowers that bloom in different months
B
birds that have different mating calls
C
fruit flies that mate in different locations
D
squirrels that have different fur colors
12

A theory is accepted as true when

A
a single experiment produces evidence that proves it is true.
B
several prominent scientists support the theory.
C
several repeated experiments yield similar results.
D
a few significant experiments produce similar results.
13

A population of wolves in Wyoming experienced a rapid decline. Scientists found that 20 wolves died from rabies, 15 wolves died from mange (a parasitic mite), and 10 wolves died from natural causes. Wyoming experienced a recent drought, and many populations, including deer, bison, and bear, have diminished in the past year. What is best described in this scenario?

A
Wolves reached their greatest population growth.
B
Wolves were exposed to too many limiting factors.
C
Wolves were unaffected by other populations in Wyoming.
D
Wolves’ breeding season was affected by the drought.
14

Explain how microevolution and migration can affect an ecosystem.

Answer not available
15

Consider the group of giraffes in the image below.Which statement about the giraffes explains their evolution based on Charles Darwin’s main points?

Question illustration
A
The closest fossil ancestor to these giraffes would have a very short neck.
B
All three of the giraffes have an equal chance of reproducing regardless of the environment.
C
As a giraffe reached for food, the giraffe could make its neck longer making it better adapted to the environment.
D
Long necks were a random genetic change and resulted in the gradual increase of organisms with long necks.
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

The negative impacts of nonnative species generally outweigh the positive impacts.

A
T
B
F
18

Consider the following food chain:Garden plants are eaten by snails, which are eaten by birds, which are eaten by the household cat.

A
A
B
B
C
C
D
D
19

What will happen to the frequency of the recessive allele for the HbS gene when there is an outbreak of malaria?

A
The frequency will increase.
B
The frequency will decrease.
C
The frequency will remain constant.
D
It is impossible to predict how the allele frequency will change.
E
The frequency will be cut in half with each generation.
20

A muskrat population is growing exponentially. What might cause this population to enter logistic growth?

A
resources become scarce
B
birth rate increases
C
emigration decreases
D
carrying capacity is increased

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