Worksheets7th Grade Science Review
Total questions: 40
Worksheet time: 21mins
Name
Class
Date
1.
Much of the world’s tropical rain forests have disappeared due to human activities. By the end of the 1990s, only about 5 percent of India’s original forests were still standing. Which of the following is NOT a potential effect of deforestation?
a)
Land degradation
b)
Desertification
c)
Increased oxygen in the atomsphere
d)
Decreased biodiversity
Decreased biodiversity
2.
Human activities can affect plant growth. Suppose an industrial park is developed near a forested area. Which of the following environmental factors is most likely to affect the forest?
a)
air pollution
air pollution
b)
lack of rainfall
lack of rainfall
c)
too much rainfall
too much rainfall
d)
decrease in temperature
decrease in temperature
3.
One problem associated with urbanization is an increase in allergies and respiratory illnesses. What is the main contributor to allergies and respiratory illnesses in urban areas?
a)
air pollution
b)
increased air temperature
c)
changes in precipitation cycles
d)
release of sewage into oceans, lakes and rivers
4.
Urbanization is the growth of urban areas caused by people moving into cities. What is one major effect of urbanization on the environment?
a)
More natural areas are created for people to enjoy.
b)
Local air temperatures tend to increase
c)
The ozone layer gets thicker.
d)
Global warming decreases.
5.
Desertification is often an unintended result of human activities. Which human activity helps reverse desertification?
a)
deforestation
b)
adopting practices to prevent overgrazing
c)
removal of topsoil and native vegetation
d)
slash-and-burn agriculture
6.
Human activities can affect the flow of water in a stream or river. Which of the following is most likely to result from changing natural water flow?
a)
The temperature of Earth's atmosphere will increase.
b)
The ecology and biodiversity in areas where water flow is changed will also change.
c)
More pollutants will seep into the water supply.
d)
Fewer people will have access to clean water.
7.
A description of weather includes many different types of data. What two weather conditions do NOT help to describe a region’s general climate?
a)
wind and latitude
b)
cloud cover and hours of daylight
c)
elevation and nearness to water
d)
temperature and precipitation
8.
When people talk about the conditions outside, they often confuse the terms weather and climate. What is the difference between weather and climate?
a)
Weather conditions change daily but climate conditions do not change
b)
Climate describes the average precipitation while weather describes the average temperature
c)
Weather describes the conditions of the atmosphere and climate describes the average temperature.
d)
Weather describes the conditions of the atmosphere and climate describes the pattern of weather over a long period of time.
9.
The sun emits harmful ultraviolet radiation, some of which reaches Earth's surface. Scientists recommend that people who plan on being outdoors for at least 20 minutes apply sunscreen to protect their skin from ultraviolet radiation. What blocks most of the sun’s ultraviolet radiation from reaching Earth's surface?
a)
.wind
b)
precipitation
c)
clouds
d)
atmosphere
10.
All plants are classified together in the plant kingdom. What are two characteristics that are used to classify an organism in the plant kingdom?
a)
presence of cell wall and ability to make sugars
b)
unicellular and carry out photosynthesis
c)
multicellular and ability to move about independently
d)
prokaryotic and lack organelles
11.
Archaebacteria is a kingdom consisting of bacteria that live in harsh environments in which few organisms are able to survive. In which of the following habitats would you most likely find members of this kingdom?
a)
a tropical rain forest in Brazil
b)
in a hot spring in Yellowstone National Park
c)
in a coral reef in Australia
d)
in a swamp in Florida
12.
An object moves through space with balanced forces acting on it. Which statement best describes the speed and direction of the object as long as the forces acting on it remain balanced?
a)
The speed and direction of the object will both change
b)
The speed and direction of the object will remain constant.
c)
The speed will change, but the direction will remain constant.
d)
The speed will remain constant, but the direction will change.
13.
An unbalanced force on an object can change its direction. Which of the following set of conditions would cause an object to move upward? N is the unit for force in newtons and the arrow indicates in which direction the force is being applied. .
a)
20 N ↓ and 20 N ↑
b)
25 N ↓ and 20 N ↑
c)
30 N ↑ and 35 N ↓
d)
35 N ↑ and 30 N ↓
14.
During the car ride home from school, Peter explained to his father what he learned about motion in class that day. He predicted to his father that they would experience negative acceleration before they arrived home. When did Peter and his father experience negative acceleration?
a)
.when they filled the car up with gas
b)
when they passed another car
c)
when they drove out of the school parking lot onto the road
d)
when they approached a stop sign
15.
Leanna decided to rearrange her bedroom by moving her dresser to the opposite wall. She tried pushing it, but found that the dresser would not move. What force was Leanne NOT able to overcome?
a)
electrical force
b)
magnetic force
c)
.balanced force
d)
frictional force
16.
Gravitational force between objects depends on mass and distance. Venus and Earth have about the same mass. However, the gravitational force between Venus and the sun is stronger than the gravitational force between Earth and the sun. What is the reason for this difference?
a)
Earth is closer to the Sun.
b)
Venus is closer to the Sun.
c)
Venus and Earth are far apart
d)
Venus and Earth are close together.
17.
The interaction between the cryosphere and hydrosphere can have an impact on Earth’s oceans. Which of the following is an example of an interaction between the cryosphere and hydrosphere?a. bc.d.
a)
evaporation of water from oceans at the equator
b)
release of fresh water into ocean water as icebergs melt
c)
decomposition of organic matter at the bottom of oceans
d)
release of large amounts of salt from icebergs into the ocean
18.
Ice from glaciers carves parts of Earth’s crust, changing V-shaped river valleys into broad, U-shaped valleys. Which of the following spheres are interacting?
a)
geosphere and biosphere
b)
cryosphere and geosphere
c)
biosphere and hydrosphere
d)
hydrosphere and cryosphere
19.
Satellite images show that the ozone layer above the North and South poles is thinner than over other parts of Earth. Ozone blocks certain harmful radiation from the sun. Which of the following is most likely to happen as a result of a thinner ozone layer?
a)
The number of meteorites that strike the planet's surface will increase
b)
Thermal energy trapped close to the planet’s surface will decrease.
c)
Satellite signals will be negatively affected where the ozone layer is thin.
d)
More people may be diagnosed with skin damage.
20.
An introduced species is one that is accidentally or intentionally added to an ecosystem. Lionfish are an introduced species originally from the Western Pacific Ocean that has the potential to harm Florida’s coral reefs. Lionfish reproduce all year long and consume parrotfish, a beneficial species of fish that eats algae. Over time, this may cause the reefs to be overgrown with algae. Which of the following best describes the relationship between parrotfish and lionfish?
a)
competition
b)
commensalism
c)
mutualism
d)
predation
21.
Organisms in a food web are classified as producers, consumers, and decomposers. What information is needed to classify organisms into these categories?
a)
how the organisms get the energy they need
b)
the size of each organism
c)
the environment each organism lives in
d)
the amount of water the organisms need
22.
Many factors limit the growth of populations in ecosystems. Human activity can cause changes in ecosystems and can affect the limiting factors that act on populations. Which of the following factors that can limit population growth has been most affected by humans?
a)
predator-prey relationships
b)
parasitism
c)
drought and flooding
d)
size of natural habitats
23.
Different populations in the same ecosystem can have different limiting factors. A scientist recorded the factors that limit the growth of some of the species in an oak forest. Her results are shown in the table below.
OAK FOREST ECOSYSTEM
Population Limiting Factor
songbirds nesting sites
squirrels acorns
oak trees water
wildflowers light
After the scientist made her observations, a disease struck the oak trees in this ecosystem, causing many of their leaves to drop. What population would most likely increase in size as a result of this change?
OAK FOREST ECOSYSTEM
Population Limiting Factor
songbirds nesting sites
squirrels acorns
oak trees water
wildflowers light
After the scientist made her observations, a disease struck the oak trees in this ecosystem, causing many of their leaves to drop. What population would most likely increase in size as a result of this change?
a)
songbirds
b)
squirrels
c)
oak trees
d)
wildflowers
24.
Convection currents circulate energy as heat in Earth’s interior. In which of Earth’s layers are the convection currents?
a)
the crust
b)
the lithosphere
c)
the mantle
d)
the inner core
25.
Jason looked at a map of the ocean floor and saw a mid-ocean ridge. How did the ridge form?
a)
Hot spots erupted along the ocean floor and created a ridge.
b)
Two tectonic plates moved toward each other, or converged.
c)
Two tectonic plates moved away from each other, or diverged.
d)
Earthquakes created a long ridge on the ocean floor.
26.
Every organism requires a set of instructions that specifies its traits. This information is carried within the cells of the organism. Which set of statements best describes hereditary information in eukaryotic cells?
a)
Genes are made up of chromosomes. Chromosomes and genes are found in the cell’s cytoplasm.
b)
Chromosomes are made up of genes. Chromosomes and genes are found in the cell's cytoplasm.
c)
Genes are made up of chromosomes. Chromosomes and genes are found in the cell's nucleus.
d)
Chromosomes are made up of genes. chomosomes and genes are found in the cell's nucleus.
27.
Mark wrote down four statements about heredity. He wrote each statement on a different index card and then shuffled the cards. He gave the four cards to Alicia and asked her to arrange them in the proper order. Alicia looked at the cards that were arranged in the following order:1. Each chromosome can contain many genes.2. Each gene is made of DNA.3. Each DNA molecule is made from chemical compounds known as nucleotides.4. Each nucleus can contain many chromosomes.How should Alicia order these four cards to show the correct sequence starting from the simplest level of organization?
a)
4- 1 - 2 -3
b)
3 - 2 - 1 - 4
c)
2 -3 - 1 - 4
d)
2 - 4 - 1 - 3
28.
There are two kinds of reproduction—asexual and sexual. Which of the statements correctly states a difference between the two types of reproduction?
a)
Sexual reproduction involves transfer of genetic information, but asexual reproduction does not.
Sexual reproduction involves transfer of genetic information, but asexual reproduction does not.
b)
Asexual reproduction involves meiosis, but sexual reproduction does not.
Asexual reproduction involves meiosis, but sexual reproduction does not.
c)
exual reproduction involves two parent organisms, but asexual reproduction does not.
d)
Asexual reproduction produces new organisms, but sexual reproduction does not.
Asexual reproduction produces new organisms, but sexual reproduction does not.
29.
The body cells of a particular multicellular organism each contain 32 chromosomes. This organism undergoes sexual reproduction. How many chromosomes will be found in the organism’s sex cells?
a)
8
b)
16
c)
32
d)
64
30.
The diagram below is being used to compare sexual reproduction and asexual reproduction. Which of the phrases below should be placed in the section of the diagram labeled “Both”?
Sexual Both Asexual
Sexual Both Asexual
a)
genetic information passes to next generation
genetic information passes to next generation
b)
always involves meiosis
always involves meiosis
c)
genetic information from two organisms combines
genetic information from two organisms combines
d)
d.involves mitosis but not meiosis
d.involves mitosis but not meiosis
31.
Light that is reflected off of objects can be detected by our eyes. This is why you can see your image in a mirror. Why can’t you see your image reflected off of a wall?
a)
Your eyes detect all of the reflected light.
Your eyes detect all of the reflected light.
b)
A wall absorbs all of the light that strikes it.
c)
Light waves do not travel far after striking an object such as a wall.
Light waves do not travel far after striking an object such as a wall.
d)
Not all of the light that reflects off of a wall is directed toward your eyes.
Not all of the light that reflects off of a wall is directed toward your eyes.
32.
Kareem told his friend about the beautiful rainbow he saw just after a rainstorm. Kareem then explained to his friend how a rainbow forms. What was Kareem’s explanation?
a)
The light waves were refracted by moisture in the air and separated into colors.
The light waves were refracted by moisture in the air and separated into colors.
b)
Tiny droplets of water reflected the light waves that struck them.
Tiny droplets of water reflected the light waves that struck them.
c)
Light traveled faster after the rainstorm because of the moisture in the air.
Light traveled faster after the rainstorm because of the moisture in the air.
d)
The intensity of light increased as the waves passed through tiny droplets of water.
The intensity of light increased as the waves passed through tiny droplets of water.
33.
What always happens to light that is refracted?
a)
The light is bent.
The light is bent.
b)
The light gets brighter.
The light gets brighter.
c)
The light is absorbed.
The light is absorbed.
d)
d.The light breaks up into different colors.
d.The light breaks up into different colors.
34.
Sound waves can move at different speeds. What can affect the speed at which sound waves travel?
a)
the amplitude of sound waves
the amplitude of sound waves
b)
the material through which sound waves travel
c)
the distance over which sound waves travel
the distance over which sound waves travel
d)
the frequency of sound waves
35.
What happens to the speed of a sound wave as it passes from the air into the ground?
a)
it decreases
b)
it increases
c)
it remains constant
d)
it stops immediately
36.
Sound waves travel at different speeds through different materials. Through which of the following materials will sound waves travel the fastest?
a)
copper pipe
copper pipe
b)
swimming pool
swimming pool
c)
air on a cold day
air on a cold day
d)
sauna filled with steam
sauna filled with steam
37.
The pitch of a sound wave describes how low or high it sounds to the human ear. Pitch and frequency are related. Which of the following best describes this relationship?
a)
The lower the frequency, the higher the pitch of sound.
The lower the frequency, the higher the pitch of sound.
b)
The lower the frequency, the slower the speed of sound.
The lower the frequency, the slower the speed of sound.
c)
The higher the frequency, the lower the pitch of the sound.
The higher the frequency, the lower the pitch of the sound.
d)
The higher the frequency, the higher the pitch of the sound.
The higher the frequency, the higher the pitch of the sound.
38.
Sound waves and light waves behave differently in different materials. How are sound waves different from light waves?
a)
Sound waves cannot travel through a vacuum.
Sound waves cannot travel through a vacuum.
b)
b.Light waves cannot travel through a vacuum.
b.Light waves cannot travel through a vacuum.
c)
Only sound waves can pass through a material.
Only sound waves can pass through a material.
d)
Only light waves can pass through a material.
Only light waves can pass through a material.
39.
The sun’s energy arrives as radiation. Which statement about electromagnetic radiation is correct?
a)
All radiation is visible.
All radiation is visible.
b)
All radiation is invisible.
All radiation is invisible.
c)
Radiation is the transfer of energy as waves.
Radiation is the transfer of energy as waves.
d)
d.Radiation travels faster than the speed of light.
d.Radiation travels faster than the speed of light.
40.
White light is made up of a spectrum of many different colors. What property is used to divide the various colors in the spectrum?
a)
density
b)
speed
c)
wavelength
d)
temperature
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