AnswersFL-2002070-MJ Comprehensive Science 2Unit Test

Unit Test — Cumulative exam Answers

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1
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Which scenario would result in a positive population growth?Use this formula: population growth = (birth rate + immigration) – (death rate + emigration)

A
30 individuals emigrate, 30 individuals die, 30 individuals are born, 0 individuals immigrate
B
22 individuals emigrate, 10 individuals are born, 12 individuals immigrate, 0 individuals die
C
15 individuals immigrate, 9 individuals emigrate, 6 individuals are born, 0 individuals die
D
18 individuals immigrate, 20 individuals die, 1 individual is born, 0 individuals emigrate
2
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Which describes a relationship in which one organism kills and eats another organism?

A
mutualism
B
predation
C
competition
D
commensalism
3

The diagram illustrates radioactive decay.

Question illustration
A
Structure 1 is an unstable atom that turns into structure 2, a new atom.
B
Structure 1 is a stable element that breaks down into structure 2, an unstable element.
C
Structure 1 is a radioactive element that loses particles to create structure 2, released energy.
D
Structure 1 is a radioactive atom that decays into structure 2, half of the original unstable element.
4

What did Darwin think about Earth and life while he was forming his theory of evolution?

A
Earth changes slowly over time, so populations might also.
B
Earth might cause rapid changes in the traits of individuals.
C
Earth cannot sustain large populations, so many animals become extinct.
D
Earth does not change much, so populations must adapt to survive.
5

The Chesapeake Bay is an important natural resource. Over the years, the number of oysters in the bay has declined dramatically, largely because of fishers who catch them and sell them as food. This has affected many other organisms that depend on oysters.

A
eutrophication
B
non-sustainable harvesting
C
nonnative species introduction
D
pollution
6

Which phrase describes faults?

A
cause gaps in the geologic record
B
cause rocks to break and move
C
are older than surrounding rocks
D
are igneous rocks that form beneath Earth’s surface
7

Which best describes the relationship between population size, carrying capacity, and limiting factors?

A
The size of a population usually stays high due to its carrying capacity and limiting factors.
B
The size of a population usually stays near its limiting factors due to carrying capacity.
C
The size of a population usually stays near its carrying capacity due to limiting factors.
D
The size of a population usually stays low due to its carrying capacity and limiting factors.
8

Sydney drew a flow chart to illustrate the nitrogen cycle.

Question illustration
A
X: Producers undergo photosynthesis.Y: Nitrogen compounds are released into the air.
B
X: Nitrogen compounds are released into the air.Y: Producers undergo photosynthesis.
C
X: Free nitrogen is in the atmosphere.Y: Producers absorb nitrogen compounds through their roots.
D
X: Producers absorb nitrogen compounds through their roots.Y: Free nitrogen is in the atmosphere.
9

Which best explains why males have a greater probability of being color blind than females?

A
Males only have to inherit the allele on the Y chromosome to be color blind.
B
Males only have to inherit the color blindness allele once to show the trait.
C
Males have to inherit two copies of the color blindness allele to show the trait.
D
Males have to inherit the allele on two X chromosomes to be color blind.
10

Brown eye color is a dominant trait and blue eye color is a recessive trait.What typically happens when someone inherits one allele for brown eyes and one for blue eyes?

A
The person has brown eyes, and brown eye color remains a dominant trait.
B
The person has blue eyes, but brown eye color remains a dominant trait.
C
The person has brown eyes, but blue eye color becomes a dominant trait.
D
The person has blue eyes, and blue eye color becomes a dominant trait.
11

Which practice has decreased the number of disease-carrying rats around homes and businesses?

A
refrigeration
B
garbage collection
C
lichen measuring
D
water treatment
12

Which medical conditions are associated with large amounts of fat and sugar in your diet? Select three options.diabetescolor blindnessheart diseaseobesitysickle cell anemia

A
diabetes
B
color blindness
C
heart disease
D
obesity
E
sickle cell anemia
14

The diagram illustrates the water cycle.

Question illustration
A
U
B
W
C
X
D
Y
15

Some illnesses and harmful infections are caused by bacteria. These bacteria grow in the human body and often make people sick with symptoms like coughing, sneezing, and fever. These illnesses are not related to any genetic mutations or other problems with DNA.

A
Gene therapy reduces symptoms but never cures illnesses.
B
Gene therapy does not work on most people.
C
Gene therapy only focuses on replacing mutated genes.
D
Gene therapy is too long a process.
16

Which sequence furthers scientific knowledge?

A
Hypotheses generate a scientific question, leading to observations, which can be tested through an experiment.
B
Observations generate a scientific question, leading to a hypothesis, which can be tested through an experiment.
C
Hypotheses generate a scientific experiment, leading to observations, which can be tested through a question.
D
Observations generate a scientific experiment, leading to a hypothesis, which can be tested through a question.
17

An adult panda bear must eat at least 30 pounds of bamboo in a day. There are 12 adult pandas living in part of a bamboo forest.How many pounds of bamboo, at minimum, must be available each day in order to support the population of pandas?

A
12
B
30
C
348
D
360
18

In a given year, which would result in the greatest increase in population size?

A
high birth rate, high death rate, high immigration, high emigration
B
high birth rate, zero death rate, high immigration, zero emigration
C
zero birth rate, low death rate, zero immigration, low emigration
D
zero birth rate, zero death rate, low immigration, high emigration
19

Which statement describes an advantage of asexual reproduction?

A
Asexual reproduction results in variations in DNA.
B
Asexual reproduction causes less competition for resources.
C
Asexual reproduction is faster than sexual reproduction.
D
Asexual reproduction requires more energy than sexual reproduction.
20

The producer in an energy pyramid contains about 1,000 kcal of energy.About how much of this energy is used by the producer or lost as heat to the environment?

A
10 kcal
B
90 kcal
C
100 kcal
D
900 kcal
21

Construction sites move lots of sediment. Which environmental factors are most likely affected by construction sites?

A
air quality and water quality
B
air quality and trash collection
C
trash collection and refrigeration
D
refrigeration and water quality

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