Worksheets8th grade mixed review
Total questions: 100
Worksheet time: 2hrs 40mins
Scientific Inquiry - BooBoo believes that his plants grow so well because he is always playing music in his room. What is a question he might ask to test this?
Does music have an effect on plant growth?
Which music groups like plants?
Does plant growth make music sound better?
Why do dying plants hate music?
Scientific Inquiry - Which variable values should be chosen at the beginning of the experiment and be different for every group?
controlled variables
dependent variable
independent variable
unnecessary variable
Scientific Inquiry - The size of the plant would be the dependent variable for an experiment for which of the following testable questions?
Does plant size affect the amount of carbon dioxide that is absorbed?
What light brightness makes plants grow the largest?
Which fertilizer makes plants grow the fastest?
Which types of plants will die in mercury-polluted soil?
Scientific Inquiry - Which of the following could be a valid hypothesis for the following testable question? "What brand of bubblegum produces the biggest bubbles?"
Bubble gum with sugar will produce larger bubbles than regular sugar-free chewing gum.
Gum chewed for a long time produces larger bubbles than gum chewed for short periods.
Males and females blow the same size gum bubbles.
All brands of bubble gum produce the same size bubbles.
Scientific Inquiry - Which of the following would be a valid hypothesis for the testable question, "Does having worms in soil help plants grow faster?"
If there are worms in the soil, then plants will grow slower.
If plants grow fast, then will be more worms will move to that soil.
If fertilizer is added to soil, then the worms will die
If plants are removed from the soil, then the worms will not be affected.
Scientific Inquiry - Kay Kay believes that studying is for suckers. What would be a testable question to test whether studying is worth wasting all that valuable time?
How many people agree that studying is for suckers?
How does the amount of time spent studying affect test grades?
What do cool people like me do in their spare time?
Which class do kids cheat in the most?
Scientific Inquiry - Look at the following pictures of student projects. Which one would be considered a scientific model?
Both are scientific models because they are both 3D
Model A because it can help you explain the water cycle
Model B because it can help explain feeding relationships in the Savanna
Neither because they were not made by scientists
Scientific Inquiry - A group of students asked the testable question, "Are male students faster at performing jumping jacks than female students?", and obtained the results below. Which of the following graphs supports the analysis that there is no significant difference in the speed of jumpingjacks when it comes to gender?
Scientific Inquiry - A group of students asked the testable question, "Are male students faster at performing jumping jacks than female students?", and obtained the results below. Which of the following graphs would be the best choice to determine which student performed the most jumping jacks in 30 seconds?
Scientific Inquiry - Which of the following statements uses the CER to answer the question, "Why did the chicken cross the road?"
Because it wanted to go to the other side.
The other day chicken crossed the road in the morning. The chicken had white feathers and a small beak. Chickens cross the road when they have white feathers and small beaks as a way to get to the other side of the road because they have small brains and often get run over. If chickens get run over they never get to the other side of the road.
Albert Einstein once said, "The chicken did not cross the road. The road passed beneath the chicken." There are billions and billions of such chickens, crossing roads just like this one, all across the universe. The chicken crossed the road because it put one foot in front of the other and took a sufficient number of steps to traverse a distance greater than or equal to the road’s width.
The chicken crossed the road because it wanted to get to the other side. In the book, "Why do chickens cross roads?" by Ted Arnold, the author claims that "the chicken crossed the road in order to escape the possibility of being taken and cooked in a rotissery." Since the chicken did not want to become food for humans it is only logical that it would want to cross the road and escape with its life.
Heat - Heat transfer within a moving liquid (fluid) is _____.
Radiation
Conduction
Convection
Kinetic Energy
Heat - What happens to the thermal energy as ice melts in water?
Thermal energy is transferred from the ice to the water
Thermal energy is transferred from the water to the ice
Thermal energy is equally transferred between the ice and the water
Thermal energy is not transferred between the ice and the water
Heat - What is happening when heat is transferred?
Energy moves from a cooler object to a warmer object
Energy remains in one place
Energy moves from a warmer object to a cooler object
Heat can't be transferred
Heat - A spoon has been heated and then placed on top of ice-cream. Which way is heat flowing?
From the air to the spoon
From the ice cream to the spoon
From the spoon to the ice cream
From the spoon to the air
Heat - You are walking along a railway and you notice that there are small gaps between the rail sections. Why?
These gaps allow for the rails to expand when it is hot.
The construction workers did not measure properly.
These gaps allow for the rails to contract when it is hot.
The gaps serve no purpose.
Heat - What happens to the mass of an object as it is heated up?
Increases
Decreases
Expands
Stays the same
Heat - When an object is cooled down, its density _____.
Increases
Decreases
Expands
Stays the same
Heat - In thinking about how energy affects states of matter, which of the following is a false statement?
Solids absorb energy to melt
Liquids absorb energy to evaporate
Gases must release energy to become liquids
Solids must release energy to become vapors
Heat - Which of the following depicts states of matter from low to high energy?
Solid, liquid, gas, plasma
Plasma, gas, liquid, solid
Plasma, solid, liquid, gas
Liquid, solid, plasma, gas
Heat - Your mom asks you to be careful when removing a pot from the stove. "The pot's handle may still be hot", she states. What is the best description of how the handle became warm?
Convection of thermal energy through the material of the handle
Conduction of heat through the material of the handle
Conduction of thermal energy through the pot's contents into the material of the handle
Radiation of thermal energy through the material of the handle
Heat - When you turn a liquid into a solid, you ____ heat. The particles will need ___ space
add; more
add; less
remove; more
remove; less
Heat - The two insulated beakers shown contain equal amounts of identical liquids. The temperature of Beaker A is 100°C. The temperature of Beaker B is 50°C. A copper rod connects the beakers. The system is then left alone for several hours. What would you expect to find when the system is examined after this time?
The temperature of Beaker A would be 50°C and the temperature of Beaker B would be 80°C.
The temperatures of the two beakers would be unchanged.
Both of the beakers would be at a temperature of 50°C.
Both of the beakers would be at a temperature of 75°C.
Heat - Look at the following model. Identify the different types of heat transfer
A = Convection; B = Radiation; C = Conduction
A = Conduction; B = Convection; C = Radiation
A =Radiation; B = Convection; C = Conduction
A = Convection; B = Conduction; C = Radiation
Weather and Climate - All weather is caused by
wind speed
the uneven heating of the Earth by the Sun
rainfall
temperature
Weather and Climate - Which type of weather most likely occurs in a high pressure area?
clear
foggy
rainy
snowy
Weather and Climate - Which term describes a circulation of air or water that is caused by uneven heating?
convection current
radiation current
conduction current
greenhouse gases
Weather and Climate - What weather change is most likely to happen if air pressure is falling?
The weather will become warmer
The weather will become stormy
The weather will become cooler
The weather will become fair
Weather and Climate - Which of the following is a direct result of condensation?
ice forms
dew evaporates
strong winds form
clouds form
Weather and Climate - The 2 main factors that determine climate are...
temperature
wind
air pressure
humidity
precipitation
Weather and Climate - What does the symbol shown below tell you about the weather at City A?
cloudy skies, with strong winds from the northwest
cloudy skies, with strong winds from the southeast
clear skies, with strong winds from the northwest
clear skies, with strong winds from the southeast
Weather and Climate - Based on the weather station symbols shown below, what is the most likely location of the low pressure system?
just west of City A
just east of City A
just west of Station B
just east of Station B
Weather and Climate - Weather or climate: The year 1976 was one of the hottest on record.
weather
climate
Weather and Climate - San Jose is hotter than Alaska
weather
climate
Weather and Climate - Which of the following images would you use to explain climate trends?
Climate change - What do greenhouse gases do in our atmosphere?
They absorb radiation given off by the Earth
They keep all the air within the Earth
They block harmful radiation from reaching the Earth
They make the Earth cooler
Climate change - What do humans do that releases greenhouse gases into the atmosphere?
Burn fossil fuels (like gas and coal)
Ride bikes and use solar energy
Build cement buildings
Compete in the Olympics
Climate change - Do we need greenhouse gases on Earth?
Yes - they keep the Earth warm
No - they only cause terrible climate change
Yes - they keep all the gases on our planet
No - they only block some of the Sun's rays
Climate change - Which of the following are greenhouse gases?
Carbon dioxide
Water vapor
Nitrogen
Methane
Helium
Climate change - What is the greenhouse effect?
Greenhouse gases trap in UV radiation and warm the Earth.
Greenhouse gases trap carbon dioxide and warm the Earth.
Greenhouse gases trap carbon dioxide so plants can grow.
Greenhouse gases trap infrared radiation and warm the Earth.
Climate change - The average global temperature has __________________ during the 20th century.
remained the same
increased
risen & fallen some years, but overall increased
risen & fallen some years but overall decreased
Climate change - What is climate?
A long period of time.
Atmospheric conditions of a place at a particular point in time.
Average atmospheric conditions of a place over a long period of time, usually 30 years.
Current weather outlook of a place.
Climate change - Which of the following is the best conclusion that can be made from this graph?
Atmospheric carbon dioxide levels have been decreasing since 1960
Hawaii has a lot of carbon dioxide
Humans have been working hard to decrease carbon dioxide levels
Atmospheric carbon dioxide levels have increased steadily since 1960s.
Climate change - Which of the following models could be used to illustrate how human-generated emissions have affected the greenhouse effect?
Climate change - Which of the following is the best conclusion that can be made from this graph?
Average temperatures change from year to year.
Atmospheric concentrations of carbon dioxide have increased steadily since the 1850's
Green house gases have no relationship to global average temperatures. In the 1910s the temperature was very cold even though the concentrations of greenhouse gases were relatively high.
Although global average temperatures fluctuate from year to year, the global average temperatures have increased as the levels of carbon dioxide have increased
A species of small fish lives in a shady pond with a dark bottom. Some of these small fish are light colored and some are dark colored. A new predator is added to the pond and one of its primary food sources is the small fish. The table shows the percent of each color of fish in this population before the predator was added. Based on the data in the table, select the best phase to complete each sentence.
After the new predator was added to the pond the ____ have a better change of surviving. This is because the predator ____.
light colored fish; cannot see them as well as the dark colored fish
light colored fish; can move faster than the small fish
dark colored fish; cannot see them as well as the light colored fish
dark colored fish; can move faster than the small fish
Claims and Evidence - What does Evidence mean?
A statement of an opposing argument
All scientific data that supports your claim
Statement you believe to be true
An opinion
Claims and Evidence - What does Reasoning mean?
A solid and reasonable argument
A written response to a claim
An explanation that connects your evidence back to the claim
An opinion you believe in
Claims and Evidence - Which statement is relevant evidence?
I believe that the steelers are the best football team in the NFL
My brother loves Star Wars.
My family has a computer at home.
In a recent study, 78% of students stated they like community service.
Claims and Evidence - What are good examples of Evidence to help support a claim?
Research and survey results
Opinions from experts in the specific field of study your claim is about
Statistics
Opinions from an expert
Claims and Evidence - "Students should not be required to do community service." This is an example of
evidence that supports a claim
reasoning that connects the evidence to a claim
a claim statement
Claims and Evidence - "Most students participate in extracurricular activities and do not have time for community service." This is an example of
evidence that supports a claim
reasoning that connects the evidence to a claim
a claim statement
Claims and Evidence - Read the following excerpt from an essay:
"More protective gear should be worn by all football players because many schools don't use it. Kendall High School and Roberts High School do not use protective gear. Two of their football players were injured during football games last year. Requiring more protective gear will make all players safe."
Does the author provide evidence to support the claim?
No, the evidence that many schools do not use protective gear is false.
Yes, by stating that all players will be safe we know that they are looking out for players
Yes, the evidence mentions specific schools that do not use protective gear
No, the evidence about a couple of players being injured is not enough to support the claim
Claims and Evidence - Read the following excerpt from an essay:
"Establishing wildlife reserves is an effective way to protect endangered species. According to the WWF, one of the larges animal protection agencies in the world, nearly 0.1% of animals go extinct each year. raising animals in a protected reserve has proven results. Researchers have successfully raised Andean condors in captivity for 70 years. In the wild, Andean condors live for up to 40 years"
Which of the following statements is the evidence that supports the claim?
Establishing wildlife reserves is an effective way to protect endangered animals.
Researchers have successfully raised Andean condors in captivity for 70 years.
According to the WWF, one of the largest animal protection agencies in the world, nearly 0.1% of animals go extinct each year.
In the wild, Andean condors live for up to 40 years.
Claims and Evidence - Read the following excerpt from an essay:
"Everyone wants to live in a clean environment. This is something that all humans and animals deserve. Therefore, everyone should recycle. Scientists agree that up to 90% of all plastic, paper and glass bottles can be recycled. Anyone that does not recycle should pay a fine"
Does the author provide enough evidence to support the claim?
No, not everyone can pay a fine if they do not recycle
Yes, he added information from expert scientists
No, the author is merely giving his opinion without any relevant evidence
Yes, it is common knowledge that we should all recycle
Plate tectonics: These plate boundaries push and collide towards other plate boundaries
Plate tectonics: These plate boundaries slide and grind past one another
Plate tectonics: The Lithospheric Plates move due to a process in the mantle called...
Plate tectonics: Which of the following were peices of evidence used by Alfred Wegener to support his hypothesis of Continental Drift? (choose ALL that apply)
fit of the continents
matching rocks and mountains across continents
matching fossils across continents
evidence of glaciers in places now too warm
magnetic striping on the seafloor showing seafloor spreading
Plate tectonics: Wegener found fossils of ancient ferns on Antarctica, this shows
That some ferns can survive temperatures well below freezing
That humans put ferns on Antarctica millions of years ago
That Antarctica drifted from a warmer climate where plants could grow
That fossils can be formed in cold climates
Biogeochemical cycles: Where do animals get nitrogen from?
Biogeochemical cycles: Organisms that do not decompose can be buried and become what?
Biogeochemical cycles: What is evaporation?
Biogeochemical cycles: Organisms use nitrogen to form
Biogeochemical cycles: What is the main human source that emits Carbon Dioxide?
Biogeochemical cycles: The process by which water, wind, ice, and changes in temperature break down rock into fragments called sediments.
Biogeochemical cycles: How does carbon dioxide leave the atmosphere?
Biogeochemical cycles: Which of the following best describes the importance of biogeochemical cycles?
Biogeochemical cycles: Which of the following correctly pairs a step of the water cycle with its events?
Biogeochemical cycles: Which of the following steps of the carbon cycle is occurring at point A?
Biogeochemical cycles: Who provides energy for the water cycle to occur?
Biogeochemical cycles: What is the main biological process that consumes carbon dioxide?
Biogeochemical cycles: How does carbon dioxide leave the atmosphere?
Biogeochemical cycles: Which of the following are biotic factors in an ecosystem?
Photosynthesis and cell respiration: What is the main goal of Cellular Respiration?
to break down Glucose in the form of ATP
to make Glucose which we use for energy
to create Carbon Dioxide for plants
Respiration is a byproduct of photosynthesis
Photosynthesis and cell respiration: Which organelle does Cellular Respiration occur in?
Nucleus
Mitochrondria
Chloroplasts
Cytoplasm
Photosynthesis and cell respiration: Which of the following organisms depend on the process of cellular respiration for survival?
Animals, some algae, and phytoplankton, but not plants
Only animals, since they are the only organisms that go through the process of cellular respiration
Humans only
All organisms that break down glucose for food; including plants and animals
Photosynthesis and cell respiration: What happens to matter and energy as they go through the process of photosynthesis?
Both are lost
Both are conserved
Matter is lost, energy is conserved
Energy is lost, matter is conserved
Photosynthesis and cell respiration: Identify all of the products of cellular respiration:
Glucose and Oxygen
Carbon Dioxide and Water
Carbon Dioxide, Water, and ATP
Oxygen, Water, and Glucose
Photosynthesis and cell respiration: Which statement is true for both photosynthesis and cellular respiration?
They both occur in the mitochondria
They both are required for a cell to produce ATP
They both produce oxygen
They both have sunlight as a reactant
Photosynthesis and cell respiration: Evaluate which statement is accurate:
Oxygen is a product of photosynthesis, carbon dioxide is a product of cellular respiration
Carbon dioxide is a product of photosynthesis, oxygen is a product of cellular respiration
Glucose is a product of cellular respiration, ATP is a product of photosynthesis
Oxygen is a reactant of photosynthesis, carbon dioxide is a product
Photosynthesis and cell respiration: Identify the organism (s) that depend on photosynthesis for survival
Plants, algae, and phytoplankton
Mammals
Amphibians and reptiles
Every living organism, in some manner, depends on photosynthesis
Photosynthesis and cell respiration: Identify the gas that is a reactant in photosynthesis:
Nitrogen
Oxygen
Carbon Dioxide
Chlorophyll
Photosynthesis and cell respiration: Identify all of the products of photosynthesis
Glucose
Water and Glucose
Glucose and Oxygen
Oxygen and Carbon Dioxide
Photosynthesis and cell respiration: Identify the main energy source that is a reactant in photosynthesis
Glucose
Sunlight
Water
Carbon Dioxide
Photosynthesis and cell respiration: How does matter move through these systems (photosynthesis and respiration)
Matter changes form as it moves
Matter is recycled as the atoms are rearranged in to different molecules
Matter starts as Sunlight and moves to ATP
The amount of matter decreases as it moves through the system
Photosynthesis and cell respiration: The role of the stomata in leaves is to:
Allow gases to enter and exit the leaf
Conserve water by closing during times when too much water can transpire
Open when it rains so water can be taken in
A and B only
A and C only
Atomic structure: For an atom to be electrically neutral, it must contain the same number of _____
Conservation of Matter: Which Chemical Equation is Balanced?
Fe4+O2 ----> 4FeO2+O2
2H2+O2 ----> 2H2O
3Cr+4O₂ ---> 2Cr₂O₃
Conservation of Matter: Which Chemical Equation is Balanced?
4O2 + 2H2 + S2 ---> 2H2SO4
4H2+O2 ---> 2H2O2
3Cr+4O₂ ---> 2Cr₂O₃
Conservation of mass: Nitrogen gas (N₂) reacts with hidrogen gas (H₂)to form ammonia gas (NH₃). Models are shown in the image. Which model shows that the mass is conserved in the reaction?
Scientific inquiry: In an investigation to determine whether some metals change temperature more rapidly than others, aside from metal rods of different metals which pieces of equipment would be more useful to determine the answer?
prism, heat lamp, screen, meter stick
beaker, digital scale, stopwatch, clamps
litmus paper, beaker, pan balance, battery
hot water pan, pan to hold water, stopwatch, thermometer
DNA codes for proteins. Genetic mutations can occur in the DNA of individuals. These mutations can be beneficial, harmful or have no effect. The table shows a nuecleotide sequence of DNA that codes for a protein and the same sequence with a mutation. Which statement describes the most likely impact of the mutation?
There will be no effect because the rest of the DNA is normal
The extra nucleotide will be deleted before the protein is formed
The protein formed will not be the same as that formed from the original DNA sequence
The mutated DNA will code for the same number of aminoacids as the original sequence
In the summer, many people enjoy going to the beach. There is a beautiful beach in Argentina, which is located in the Southern Hemisphere. Which diagram shows the position of Earth when it is summer in Argentina?
A
B
C
D
When organisms are better adapted to their environment they will survive and reproduce more successfully than organisms less adapted. This process is called what?
Selective breeding
Natural Selection
Cloning
Evolution of all species
