What could happen if a lake gets too warm in the summer?

dissolved oxygen could decrease, fish die

Which best describes a bioindicator?

A species that depends on specific conditions to survive.

Which statement best explains why muscle cells have more mitochondrion than skin cells?

Muscle cells use more energy than skin cells.

Which of the following is not an example of non-point source pollution.

sewage pipes that drain directly into bodies of water

Which of the following is an example of how biotechnology can benefit agriculture?

using genes of an organism, develop disease-resistant plants

How can you identify elements that have similar properties?

They will be in the same vertical column (group)

Fertilizers applied to crop lands are high in nutrients. How could fertilizer run-off kill fish

Nitrogen causes algae to grow; algae decomposing uses oxygen

How are the noble gases (group 18) different from the other elements?

They have complete outer energy shells

Fossils of warm weather plants were found in Antarctica. What can best be concluded?

Antarctica was once located closer to the equator.

Water is used to circulate through pipes to cool machines. Why is circulating water effective?

because water has a high specific heat

According to the periodic table, which atomic properties best describe an atom of Cobalt (Co)

27 protons, 27 electrons and 32 neutrons

What do scientist mean when they say that water is a polar molecule?

Water molecules have a positive and negative end

Why would fisheries in the oceans be reduced because the estuaries near land are polluted?

Many ocean fish use the estuaries to produce offspring.

How can a scientist, using the periodic table, find elements with similar properties?

By looking in the same group or family

Which statement about the noble gases is correct?

They contain 8 valence electrons and are not reactive.

A layer of marine fossils is discovered in a desert environment. What best explains this?

The area was once covered by water.

Which of the following about the fossil record is true?

Fossil records have identified organisms that are extinct

Fossils found on different continents separated by the ocean would be evidence of

the two continents were once joined together

Which of the following is a risk of overusing antibiotics to treat infections?

Bacteria become resistant to the antibiotics

Which of the following describes a connection between an aquatic and terrestrial food web?

A polar bear catches and eats a fish in the Arctic.

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8th Grade EOG Science Review

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Complete Review For 8th Grade Science

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Questions 73

Answers

1
What could happen if a lake gets too warm in the summer?
carbon dioxide increase, more phytoplankton
dissolved oxygen could increase, more fish are caught
pH of the lake could increase, more algae
dissolved oxygen could decrease, fish die
2
What type of plate boundary is represented in the picture?
transform fault boundary
continental - ocean convergent
continental-continental convergent
ocean - ocean divergent
3
Which best describes a bioindicator?
A species that depends on specific conditions to survive.
A species that can adapt to a variety of conditions.
A species that has been introduced to an ecosystem.
A species with a short life span.
4
Which statement best explains why muscle cells have more mitochondrion than skin cells?
Muscle cells have more excess water than skin cells.
Muscle cells use more energy than skin cells.
Muscle cells have fewer proteins than skin cells
Muscle cells have a smaller nucleus than skin cells.
5
Which of the following is not an example of non-point source pollution.
chemicals that enter the water from parking lot run-off
run-off containing animal wastes
sewage pipes that drain directly into bodies of water
chemical fertilizer run-off from farms
6
A virus starts in Africa and spreads to several different continents. What would this be?
An epidemic
A vector
A pandemic
A quarantine
7
What percent of the water on earth is salt water?
3%
67%
25%
97%
8
Which below would be considered a chemical change?
All of these
Burning a piece of wood.
Melting a piece of lead.
Changing a liquid into a solid.
9
Which of the following is an example of how biotechnology can benefit agriculture?
removing water from wells to water crops daily
using genes of an organism, develop disease-resistant plants
digging a hole to plant a seed
covering seeds with soil
10
How can you identify elements that have similar properties?
They will be in the same period
They will be in the same color
They will be in the same vertical column (group)
They will be in the same horizontal row
11
How are plant and animal cells similar?
The both have chloroplasts
The both have a nucleus
They both have flagella
They both have an eyespot
12
What term would describe the picture?
transitional fossils
homologous structures
vestigial organs
analogous structures
13
Fertilizers applied to crop lands are high in nutrients. How could fertilizer run-off kill fish
Nitrogen leads to fewer algae; causes fish to starve
Nitrogen causes algae to release toxic compounds; kills fish
Nitrogen kills algae; algae decomposes using up the oxygen
Nitrogen causes algae to grow; algae decomposing uses oxygen
14
Which of the following is a physical property?
Density of water
Freezing point of water
Melting point of gold.
All of these
15
How are the noble gases (group 18) different from the other elements?
They are named for the scientist who discovered them.
They have complete outer energy shells
They are the only gaseous atoms found in nature
They form the most expensive compounds
16
Fossils of warm weather plants were found in Antarctica. What can best be concluded?
Ocean currents carried the plants to Antarctica.
Spores of plants drifted by air currents to Antarctica.
Seeds of plants have been carried to Antarctica by birds.
Antarctica was once located closer to the equator.
17
How many bacteria will you have in 2 hours if you start with 4 and they divide every 20 minutes
128
32
64
256
18
Why do atoms combine?
to form mixtures
to make new elements
to gain neutrons
to fill outer energy shells
19
Water is used to circulate through pipes to cool machines. Why is circulating water effective?
because water has a high surface tension
because water has a low specific heat
because water is a universal solvent
because water has a high specific heat
20
What allows water striders to stay on the surface of the water?
high specific heat
capillary action
surface tension
universal solvent
21
According to the periodic table, which atomic properties best describe an atom of Cobalt (Co)
27 protons, 27 electrons and 27 neutrons
59 protons, 27 electrons and 32 neutrons
32 protons, 27 electrons and 27 neutrons
27 protons, 27 electrons and 32 neutrons
22
Which physical properties make metals suitable for use in electrical wiring?
malleability and ductility
magnetism and ductility
conductivity and ductility
solubility and malleability
23
Which element has properties most like Aluminum (Al)?
Zinc (Zn)
None of these
Indium (In)
silicon (Si)
24
Which property is most likely being tested in the experiment shown next?
solubility
heat of fusion
cohesion
density
25
Which pure substance is made of more than one element?
water
gold
sodium
carbon
26
Which example of non-point pollution would probably contain the highest level of nitrates?
trash dumped in oceans
silt from a construction site
run-off from roads
run-off from golf courses
27
What do scientist mean when they say that water is a polar molecule?
Water molecules never develop a charge and are neutral
Water molecules have a positive and negative end
Water molecule are round shaped.
Water molecules are a negative charge at cold temperatures
28
Which source of water pollution includes oil and gasoline runoff from a parking lot?
non-point source pollution
eutrophication
point-source pollution
agriculture pollution
29
Which of the following conditions is most likely to develop as a result of smoking cigarettes?
liver cancer
high cholesterol
heart disease
diabetes
30
Which pure substance is composed of more than one element.
sodium
carbon
salt
gold
31
Which element is a good conductor?
Fluorine (F)
Boron (B)
Potassium (K)
Sulfur (S)
32
Why would fisheries in the oceans be reduced because the estuaries near land are polluted?
The pollution in the estuaries eventually gets in the ocean
Estuary fishers will start fishing in the ocean
Many ocean fish use the estuaries to produce offspring.
The deep-sea fish come into the estuaries to eat
33
How can a scientist, using the periodic table, find elements with similar properties?
By comparing atomic number
All of these
By looking in the same period
By looking in the same group or family
34
Which statement about the noble gases is correct?
They contain 8 valence electrons and are not reactive.
They are normally found in a diatomic state
They quickly combine with the alkali Earth metals.
The slowly combine with other gases.
35
A layer of marine fossils is discovered in a desert environment. What best explains this?
Volcanic activity once occurred in the area.
A catastrophic event once occurred in the area.
Erosion turned most of the limestone in the area into sand.
The area was once covered by water.
36
What is the charge on the nucleus of an atom?
negative
neutral
positive
It depends on the number of electrons
37
What characteristic of aluminum allows it to be made into aluminum foil?
it is soluble
it is malleable
it is dense
it is ductile
38
Which of the following is an example of a solution?
chocolate milk
all of these
sugar in water
salt in water
39
Why does it only require 12 kilograms of gold to cover the entire Georgia state capital?
gold is a good conductor
Gold is a good insulator
gold is very ductile
gold is very malleable
40
Which of the following about the fossil record is true?
All fossils have bones
Fossilized organisms aren't related to organisms alive today
Fossil records have identified organisms that are extinct
No new organisms have been discovered through fossils
41
Fossils found on different continents separated by the ocean would be evidence of
the two continents were once joined together
the two continents were once connected by a land bridge.
The animals developed on the two continents at the same time
animals swimming from one continent to another
42
Which of the following is a risk of overusing antibiotics to treat infections?
Antibiotics work only once
Bacteria become resistant to the antibiotics
Antibiotics increase the rate of infections
Antibiotics cause other diseases to develop
43
What is the only way to know if a chemical reaction has taken place?
Formation of a gas
A change in temperature
Formation of a new substance
Formation of a precipitate
44
Which of the following is evidence of a chemical reaction?
All of these
A change in temperature
A precipitate is formed
A gas is formed
45
Which of the following could be considered a physical change?
Ripping a piece of paper in half.
All of these
Changing water into steam
Changing water into ice.
46
What do scientist most often use to separate one time period from another?
human history
exact dates
chemical analysis
mass extinctions
47
What characteristic of aluminum allows it to be made into aluminum cans?
It is malleable
It is ductile
It is soluble
It is dense
48
Who is the famous person in the next picture?
Ms. St. Cyr
Dr. Gassaway
Dr. Doolittle
Bob Ross
49
How are parasites and viruses similar?
Both are contagious diseases
Both break down food using oxygen.
Both reproduce using host cells.
both infect host cells
50
Which of the following describes a connection between an aquatic and terrestrial food web?
A mosquito emerges from a swamp and is eaten by a frog.
A leaf falls in the forest and is decomposed by bacteria.
A polar bear catches and eats a fish in the Arctic.
A hawk catches and eats a mouse.
51
Which below is NOT a chemical property?
Rotting
Flammability
Freezing
Rusting
52
A pseudopod is a structure of an amoeba. Which statement best describes a pseudopod?
It is a circular structure that captures sunlight
It is an extension of cytoplasm used to move and catch food
It is a small capsule used to store food
It is a whip like structure used to capture prey
53
Which of the following is an example of how biotechnology can benefit agriculture?
covering seeds with soil
digging a hole to plant a seed
using genes of one organism to develop pest resistant plants
removing water from wells to water crops daily
54
Which below is NOT a way to increase a speed of a chemical reaction?
Increase the surface area
Add a inhibitor
Increase the concentration
Increase the temperature
55
Jan mixed two liquids together and a solid formed. What is the solid that formed called?
a solute
a solvent
a precipitate
a solution
56
Which of the following does not occur as a result of upwelling?
Warmer water is carried from the deep ocean to the surface
Nutrient-rich water goes from the deep ocean to the surface
Primary production increases at the surface
Cooler water is carried from the deep ocean to the surface
57
Which best explains the importance of dissolved gases in the ocean?
They help provide oxygen for aquatic animals.
They help control pollution.
They help maintain a constant water temperature.
They help maintain constant levels of salinity.
58
According to the periodic table which element could be used in a circuit as the best conductor
arsenic (As)
selenium (Se)
neon (Ne)
Technetium (Tc)
59
How are index fossils useful to scientist?
They are used for naming new fossils
They are used to determine where an unknown fossil is from.
They are used to develop a list of all species in the area
The are used to determine the age of a rock layer
60
Where are the metalloids located on the periodic table?
toward the bottom
along a zigzag line toward the right side
in the middle
on the left side
61
The element silicon is used for what purpose?
as a material for coins and jewelry
as a semiconductor in computer chips
as a container to keep coffee hot
as a material to make airplane frames
62
Which theory states that organisms best suited to their environment will survive and reproduce?
The theory of adaptation
The theory of variation
The theory of inherited characteristics
The theory of natural selection
63
In which type of cell would you expect to find the most mitochondria?
nerve cells
skin cells
fat cells
muscle cells
64
In which object in the picture is the buoyant force less than the gravitational force?
Object B
Object C
Object A
None of these
65
An engineer needs a material that he can roll into thin sheets. Which type of material is best
noble gases
metals
metalloids
nonmetals
66
What would scientist use to map the mid-ocean ridge?
sonar
buoys
submersibles
satellites
67
The reactants contain 12 carbon atoms and 4 oxygen atoms, what must be true about the products?
The products must have a total of 16 atoms
The product consist of carbon to oxygen atoms in a 1:1 ratio
The products must contain 12 carbon atoms and 4 oxygen atoms
The products must contain 4 carbon atoms and 12 oxygen atoms
68
What happens when water evaporates from the ocean to the atmosphere.
The total amount of water in the hydrosphere increases.
All three are correct.
The total amount of water in the hydrosphere stays the same.
The total amount of water in the hydrosphere decreases.
69
What is the relationship between salinity and the density of water?
There is no relationship between salinity and density
As salinity increases, density increases
As salinity decreases, density increases
As salinity increases, density decreases
70
The density of 100 mL. of water is found to be 1.0 g/mL. What would be the density of 50 mL.
1.0 g/mL
None of these are correct
2.0 g/mL.
.5 g/mL
71
Which best describes how an asteroid striking Earth caused the extinction of the dinosaurs?
Dust formed dense clouds which cooled the climate.
Land masses were altered by the collision.
Glaciers melted rapidly drowning the dinosaurs.
Massive fires caused by the asteroid reduced the food.
72
Which statement about fossils is true?
It is impossible to determine the age of a fossil
Newer fossils are found deeper in the ground
Older fossils are found deeper in the ground
The larger the fossil, the deeper it will sink in the ground
73
Which of the following is true about the diagram?
All the layers are the same age.
layer 5 is younger than layer 4
layer 5 is the oldest and layer 1 is the youngest
layer 2 is older than layer 3

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