Quiz about 8th Grade NC Science EOG Review 3

Question 1

Which is a compound?

Accepted Answer

sugar

Answer

sodium

Answer

nitrogen

Answer

air

Question 2

Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. Which best describes this observation?

Accepted Answer

Some of the atoms during the reaction escaped into the air.

Answer

Some of the atoms during the reaction were detroyed.

Answer

Some of the atoms during the reaction became heavier.

Answer

Some of the atoms during the reaction changed to a different kind of atom.

Question 3

This is a chemical reaction for the decomposition of carbonic acid into water and carbon dioxide. How does the reaction support the Law of Conservation of Mass?

Accepted Answer

The mass of the atoms in the reactant equals the mass of the atoms in the products.

Answer

Several molecules of water are produced.

Answer

The mass of carbon atoms is reduced during the reaction.

Answer

The mass of the hydrogen atoms is the only thing that remains the same before and after the reaction.

Question 4

Which best describes a method of obtaining energy that may cause changes in water temperature and harm to fish populations?

Accepted Answer

burning coal

Answer

using ethanol in cars

Answer

installing solar panels on a home

Answer

generating electricity in a hydroelectric power plant

Question 5

Which is a nonrenwable resource?

Accepted Answer

oil

Answer

sunlight

Answer

water

Answer

wood

Question 6

How would a large increase in the salinity of an estuary most likely affect the ecosystem of the estuary.

Accepted Answer

The number of salt-tolerant organisms would increase, and the number of salt-intolerant organisms would decrease.

Answer

All organisms would die.

Answer

All organsims would continue to live as they do now.

Answer

The number of salt-intolerant organisms would increase, and the number of salt-tolerant organisms would decrease.

Question 7

Which would indicate the water in a lake is not safe for drinking?

Accepted Answer

high turbidity levels in the lake

Answer

many varieties of fish in the lake

Answer

high dissolved-oxygen levels in the lake

Answer

cold water temperature of the lake

Question 8

A geologist identifies the identical index fossils in rock layers from two different areas. Which conclusion is best supported by this discovery.

Accepted Answer

The two rock layers were depositied at approximately the same time.

Answer

The deposition rate of the two rock layers was identical.

Answer

The fossil organism evolved independently in the two separate areas.

Answer

The index fossil will also occur in sediment deposited on top of these rock layers.

Question 9

Which supports the theory that some mountains were once at the bottom of an ocean?

Accepted Answer

Fossils of marine organisms are found on the tops of some mountains.

Answer

There are underwater mountains on the ocean floor today.

Answer

Freshwater rivers flow to the ocean.

Answer

Both mountains and ocean floors have similar minerals in their rocks.

Question 10

Which disease is caused by a fungal infection?

Accepted Answer

athlete's foot

Answer

intestinal worms

Answer

influenza

Answer

chicken pox

Question 11

How are pandemics different than epidemics?

Accepted Answer

Pandemics affect many countries or states; an epidemic is more localized.

Answer

Pandemics affect blood; epidemics affect skin.

Answer

Pandemics are caused by bacteria; epidemics are caused by viruses.

Answer

Pandemics are spread through the air; epidemics are spread through the water.

Question 12

Which is one possible human benfit from biotechnology research?

Accepted Answer

producing crops that can grow in areas where they do not normally grow

Answer

producing new typres of disease-causing viruses

Answer

increasing the ability to turn ocean water to freshwater

Answer

creating new types of buildings that can withstand hurricanes

Question 13

How has genetic engineering helped farming?

Accepted Answer

by creating crops that resist some diseases

Answer

by developing better fertilizer for crops

Answer

by producing soil that makes crops grow better

Answer

by producing faster ways to harvest crops

Question 14

In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?

Accepted Answer

The deer population would increase and begin to compete for food.

Answer

The deer population would become larger and healthier animals.

Answer

The deer population would decrease, because there would be an increase in disease.

Answer

The deer population would change color, because they would not have to hide from wolves.

Question 15

How are mutualism and parasitism different?

Accepted Answer

Both organisms benefit in mutualism, while in parasitism only one organism benefits at the other's expense.

Answer

Both organisms benefit in parasitism, while in mutualism only one organism benefits at the other's expense.

Answer

Both organisms benefit in mutualism, while in parasitism one organism benefits, and the other is neither harmed nor benefits.

Answer

Both organisms benefit in parasitism, while in mutualism one organism benefits, and the other is neither harmed nor benefits.

Question 16

What would have the greatest long-term impact on reducing the amount of carbon dioxide in the air?

Accepted Answer

planting trees around a farm

Answer

cutting down trees around a farm

Answer

increasing the number of livestock on a farm

Answer

decreasing the number of livestock on a farm

Question 17

Which evidence supports the idea that life on Earth has continually evolved?

Accepted Answer

evidence from rock layers, fossils, and ice cores

Answer

evidence from layers of tree rings

Answer

evidence gathered from melting glaciers

Answer

evidence that the climate has changed over the past 100 years

Question 18

Which would most likely increase the genetic variation in a population of organisms?

Accepted Answer

increase in mutations

Answer

increase in diseases

Answer

decrease in diseases

Answer

decrease in mutations

Question 19

Which is the primary source of energy for most of the cells in the body?

Accepted Answer

sugar

Answer

fat

Answer

protein

Answer

vitamin

Question 20

Which is classified as an element?

Accepted Answer

iron

Answer

carbon dioxide

Answer

vinegar

Answer

water

Question 21

Which best describes the sequence of elements in Period 5 of the periodic table?

Accepted Answer

highly reactive metals, relatively nonreactive metals, metalloids, reactive nonmetals, nonreactive gases

Answer

highly reactive gases, relatively nonreactive metals, metalloids, very nonreactive gases, nonreactive nonmetals

Answer

nonreactive gases, metalloids, nonreactive metals, highly reactive metals, highly reactive gases

Answer

nonreactive gases, nonreactive metals, highly reactive metals, metalloids, reactive nonmetals, reactive gases

Question 22

Which statement is true about a chemical reaction?

Accepted Answer

All of the atoms in the reactants will be a part of the products.

Answer

The physical states of the atoms in the reactants determine the products.

Answer

Some of the atoms in the reactants will be a part of the products.

Answer

The number of atoms in the reactants determines the products.

Question 23

Which are most responsible for creating acid rain pollution?

Accepted Answer

coal-burning power plants

Answer

nuclear power plants

Answer

hydroelectric power plants

Answer

wood-burning power plants

Question 24

Which best explains why all of the Earth's freshwater is not available for human use?

Accepted Answer

Most of Earth's freshwater is frozen water.

Answer

Most of Earth's freshwater is only in lakes.

Answer

Most of Earth's freshwater is underground.

Answer

Most of Earth's freshwater is still in the water cycle.

Question 25

How can upwellings improve fishing for ocean fishermen?

Accepted Answer

They bring nutrients from the cold, deep ocean waters.

Answer

They cause the ocean water to get warmer.

Answer

They cause ocean currents to remain calm.

Answer

They bring ocean currents from the equator.

Question 26

If a lake has excess levels of phosphates and nitrates in its water, what will most likely result?

Accepted Answer

The growth of algae in the lake will increase.

Answer

The temperature of the lake water will decrease.

Answer

The turbidity levels of the lake will decrease.

Answer

The dissolved-oxgen levels in the lake will increase.

Question 27

Which is the most accurate method scientists use to predict the age of the Earth?

Accepted Answer

radioactive dating of rocks

Answer

relative dating of rock layers

Answer

comparing the ages of different fossils

Answer

investigating core samples from the Arctic

Question 28

Which is the best reason for scientists to study ice cores obtained from Earth's ice caps?

Accepted Answer

to study past climates by analyzing trapped gases and particles

Answer

to evaluate potential oil drilling sites

Answer

to study the quality of water stored in glaciers

Answer

to determine the rate of melting in polar regions

Question 29

What is the most likely result of overusing a particular antibiotic?

Accepted Answer

more infections caused by bacteria resistant to the antibiotic

Answer

fewer infections caused by bacteria resistant to the antibiotic

Answer

fewer infections caused by viruses and bacteria

Answer

more infections caused by viruses

Question 30

Which illness could most likely be treated with antibiotics?

Accepted Answer

strep throat

Answer

influenza

Answer

common cold

Answer

diabetes

Question 31

How can biotechnology help farmers overcome sudden changes in the global climate?

Accepted Answer

by developing crops that are resistant to adverse weather

Answer

by changing the types of soil in which the crops are planted

Answer

by rotating the crops within the same field

Answer

by only planting crops in the winter

Question 32

How has biotechnology helped to improve the agricultural industry?

Accepted Answer

by creating some crops that resist certain insects

Answer

by developing irrigation systems that cover a large land area

Answer

by producing soil free of decomposers

Answer

by developing machines that help farmers harvest crops faster

Question 33

What happens to most of the energy as it moves throughout a food web?

Accepted Answer

It is changed into heat energy.

Answer

It is changed into light energy.

Answer

It is changed into mass.

Answer

It is changed into dceomposers.

Question 34

Which is the best evidence for evolution.

Accepted Answer

old rock layers containing fossils unlike existing organisms

Answer

new rock layers containing fossils of simple organisms

Answer

new rock layers containing fossils of existing orgnanisms

Answer

old rock layers containing fossils of complex organisms

Question 35

Which best explains why mammals became dominant after the mass extinction of the dinosaurs?

Accepted Answer

They had traits that helped them adapt to environmental changes.

Answer

They were larger than dinosaurs and ate different foods.

Answer

They lived in different areas on Earth than dinosaurs.

Answer

They were able to hibernate for thousands of years.

Question 36

Which demonstrates how genetic variation may result from a change in the environment where an animal lives?

Accepted Answer

An arctic fox changes its color over time because it migrates to an area with a different climate.

Answer

A salmon swims faster as it enters cold waters.

Answer

A snake increases its body temperature because it moves on top of a rock in direct sunlight.

Answer

A beetle stands out to predators because it moves among plants that have colors different than its own.

Question 37

Where do plants get the food they need for energy?

Accepted Answer

They produce it during photosynthesis.

Answer

They absorb it directly from the sun.

Answer

They absorb it directly from the soil.

Answer

They receive it from atmospheric gases.

Question 38

Chlorine has 7 valence electrons. With what group of elements will chlorine most readily bond?

Accepted Answer

group 1

Answer

group 2

Answer

group 16

Answer

group 18

Question 39

Which is the best example of a chemical change?

Accepted Answer

egg cooking

Answer

butter melting

Answer

paper tearing

Answer

water evaporating

Question 40

Which is most likely a major concern associated with burning fossil fuels?

Accepted Answer

Burning fossil fuels can produce smog, which can cause repsipiratory illnesses.

Answer

Burning fossil fuels can pollute the oceans.

Answer

Burning fossil fuels can remove harmful chemicals from precipitation.

Answer

Burning fossil fuels can remove carbon dioxide from the atmosphere.

Question 41

Which action shows concern for the environment with regard to the resources of the oceans?

Accepted Answer

setting limits on fish harvesting in the oceans

Answer

developing technology which will allow for an increase in fish harvesting

Answer

allowing factories to release untreated wastewater into the oceans

Answer

filling in oceanfront wetlands in order to extend beachfront properties

Question 42

What effect does the water cycle have on the total amount of water on Earth?

Accepted Answer

The total amount of water on Earth remains relatively constant.

Answer

The total amount of water on Earth is constantly increasing.

Answer

The total amount of water on Earth is constantly decreasing.

Answer

The total amount of water on Earth chnages due to periods of global warming and cooling.

Question 43

Which characteristic of water quality provides the most information regarding the health of a water system.

Accepted Answer

presence of indicator species

Answer

clarity

Answer

temperature

Answer

concentration of heavy metals

Question 44

Where is most of Earth's freshwater located?

Accepted Answer

in the ice caps

Answer

in the clouds

Answer

in the ocean

Answer

in the ground

Question 45

Which is the most accurate way of determining the age of a fossil?

Accepted Answer

radioactive dating

Answer

relative dating

Answer

dating index fossils

Answer

dating the rock layers above the fossil

Question 46

Which allows scientists to investigate what Earth's climate was like over the past 740,000 years?

Accepted Answer

ice cores

Answer

volcanic deposits

Answer

fossils

Answer

faults

Question 47

Which best describes uniformitariansim?

Accepted Answer

The processes that shape the Earth continue as they have since the Earth formed.

Answer

The time it takes for erosion to occur has changed since Earth first formed.

Answer

The movement of the continents no longer occurs because of changes in ocean currents.

Answer

The formation of rock layers has slowed because humans have altered the environment.

Question 48

Many infectious diseases have been nearly eliminated worldwide. Why should global studies of infectious diseases continue?

Accepted Answer

All infectious disease organisms have the ability to mutate, adapt, and survive.

Answer

All infectious disease organisms are fatal.

Answer

All infectious diseases are resistant to any form of treatment.

Answer

All infectious diseases are caused by viruses that do not respond to antibiotics.

Question 49

Scientists have been able to cause some bacteria to produce insulin. In which area of science would these scientists most likely work?

Accepted Answer

biotechnology

Answer

nuclear engineering

Answer

marine biology

Answer

chemistry

Question 50

If a company genetically modifies corn to produce an odor taht repels insects, which best describes how the corn was modified?

Accepted Answer

by techniques used in biotechnology

Answer

by crop rotation techniques

Answer

by chemical exposure

Answer

by harvesting at different times

Question 51

Which best represents the flow of energy within an aquatic ecosystem?

Accepted Answer

sunlight --> algae --> insects --> fish --> turtle

Answer

algae --> insects --> fish --> turtle --> sunlight

Answer

insects --> algae --> fish --> turtle --> sunlight

Answer

sunlight --> insects --> algae --> fish --> turtle

Question 52

If a bat, an alligator, and a bird evolved from a common ancestor, what most likely can be concluded.

Accepted Answer

They have similar anatomical structures.

Answer

They live in the same part of the world.

Answer

They are in the same biological classification.

Answer

They are able to survive changes in their environments.

Question 53

Recent changes in species can be found in the upper layers of rock. This provides a link between which two scientific ideas?

Accepted Answer

the theory of evolution and the Law of Superposition

Answer

cell theory and the theory of evolution

Answer

the periodic nature of the elements and cell theory

Answer

the Law of Superposition and the periodic nature of the elements

Question 54

Which of these would most likely happen to a species that is not able to adapt to a changing environment?

Accepted Answer

The species would become extinct over time.

Answer

The species would develop mutated cells.

Answer

The species would develop resistance to disease.

Answer

The species would change the environment.

Question 55

A runner is preparing to run a long race. Which would provide the highest level of energy for the runner?

Accepted Answer

carbohydrates

Answer

minerals

Answer

proteins

Answer

vitamins

Question 56

Why are digestion and respiration important to the body?

Accepted Answer

They help provide the energy needed for body functions.

Answer

They control the production of hormones in the body.

Answer

They build muscle and bone that the body needs.

Answer

They store food for the body.

8th Grade NC Science EOG Review 3

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