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WorksheetsMidterm Review
Total questions: 100
Worksheet time: 50mins
Which of the following is an abiotic factor?
Shark
Fern
Sunlight
Bacteria
A dead tree in a forest is considered:
Abiotic because it is no longer alive
Biotic because it was once living
Neither biotic nor abiotic
Both biotic and abiotic
Why is water considered an abiotic factor even though living things need it to survive?
Water is alive
Water was never alive
Water contains living organisms
Water can move on its own
Which list contains ONLY abiotic factors?
Fish population, water temperature, algae count
Water temperature, sunlight amount, oxygen levels
Frog species, lily pads, mud composition
Bacteria count, plant types, water depth
What is the correct order from smallest to largest level of organization?
Community → Population → Organism → Ecosystem
Organism → Population → Community → Ecosystem
Ecosystem → Community → Population → Organism
Population → Organism → Community → Ecosystem
All of the deer living in a forest make up a:
Community
Population
Ecosystem
Organism
A lake contains fish, frogs, algae, insects, water, rocks, and sunlight. This is best described as a(n):
Population
Community
Organism
Ecosystem
What is the difference between a community and an ecosystem?
A community includes nonliving things; an ecosystem does not
An ecosystem includes nonliving things; a community does not
They are the same thing
A community is larger than an ecosystem
What do the arrows in a food chain represent?
What eats what
The direction energy flows
Which organism is bigger
How fast organisms move
Which organism is always at the beginning of a food chain?
Herbivore
Carnivore
Producer
Decomposer
What is the main source of energy for most food chains?
Water
Soil
The Sun
Decomposers
In the food chain: Grass → Grasshopper → Frog → Snake, what would MOST LIKELY happen if the frog population suddenly decreased?
The grasshopper population would decrease
The snake population would decrease
The grass population would decrease
Nothing would change
What is the difference between a food chain and a food web?
A food chain shows energy flow; a food web does not
A food web shows multiple connected food chains; a food chain shows one path
A food chain is more accurate than a food web
There is no difference
In a predator-prey relationship, which organism benefits?
The prey
The predator
Both organisms
Neither organism
A tick attaches to a dog and feeds on its blood. The dog is harmed but the tick benefits. This relationship is called:
Mutualism
Commensalism
Parasitism
Predator-Prey
A bird builds a nest in a tree. The bird benefits by having shelter, but the tree is not helped or harmed. This is an example of:
Mutualism
Commensalism
Parasitism
Predator-Prey
Bees collect nectar from flowers to make honey. While collecting nectar, bees spread pollen which helps flowers reproduce. This relationship is:
Mutualism
Commensalism
Parasitism
Predator-Prey
A remora fish attaches to a shark and eats leftover food scraps. The shark is not affected. What type of relationship is this?
Mutualism
Parasitism
Commensalism
Predator-prey
An organism that eats both plants and animals is called a(n):
Herbivore
Carnivore
Omnivore
Producer
Which of the following is an example of a decomposer?
Grass
Deer
Mushroom
Hawk
An observation is:
A guess about what will happen
Something you directly see, hear, smell, touch, or measure
A conclusion based on evidence
An opinion about something
What is the difference between an inference and an observation?
An observation is a guess; an inference is a fact
An inference is a conclusion based on observations; an observation is what you directly notice
They are the same thing
An inference comes before an observation
You see a dog with wet fur and muddy paws. Which statement is an INFERENCE?
The dog has brown fur
The dog's paws have mud on them
The dog was playing outside in the rain
The dog is standing on the porch
You notice dark clouds in the sky and the wind is blowing hard. Which statement is a PREDICTION?
The clouds are dark gray
The wind is blowing leaves around
It will probably rain soon
A storm already passed through
'The kangaroo is brown' is an example of a(n):
Inference
Observation
Prediction
Hypothesis
'The whale will land in the water and then swim away' is an example of a(n):
Inference
Observation
Prediction
Conclusion
The ONE thing a scientist changes on purpose in an experiment is called the:
Dependent variable
Controlled variable
Independent variable
Constant
The variable that is measured in an experiment is called the:
Independent variable
Dependent variable
Controlled variable
Changed variable
Why do scientists keep some variables the same (controlled variables) during an experiment?
To make the experiment harder
To make sure the test is fair
Because those variables don't matter
To confuse other scientists
A student wants to test if the type of soil affects how tall a plant grows. She uses the same amount of water, sunlight, and pot size for each plant. What is the INDEPENDENT variable?
Plant height
Amount of water
Type of soil
Pot size
In an experiment testing how soil type affects plant height, what is the DEPENDENT variable?
Type of soil
Amount of sunlight
Plant height
Pot size
A student tests which brand of paper towel absorbs the most water. He uses different amounts of water for each brand. Why is this a problem?
Paper towels shouldn't absorb water
He won't know if the results are due to the brand or the amount of water
Using different amounts of water is the correct method
There is no problem with this experiment
Which tool is used to measure mass?
Graduated cylinder
Ruler
Triple beam balance
Thermometer
What unit is used to measure volume of a liquid?
Grams (g)
Centimeters (cm)
Milliliters (mL)
Degrees (°)
What unit is used to measure mass?
Milliliters (mL)
Grams (g)
Centimeters (cm)
Degrees (°)
Which tool is used to measure the volume of a liquid?
Triple beam balance
Graduated cylinder
Ruler
Thermometer
Why do scientists conduct multiple trials instead of just one?
To waste time
To make sure results are reliable and not just a fluke
Because one trial is illegal
To use more materials
A student's three trials for measuring distance were: 15 cm, 18 cm, and 12 cm. What is the average?
15 cm
45 cm
12 cm
18 cm
What is the correct title format for a data table?
My Experiment Data
The Effect of [Independent Variable] on [Dependent Variable]
Results Table
Science Data
Why is it important to include units when recording measurements?
Units make numbers look official
Units show what property was measured
Teachers require it
Units don't really matter
What is matter?
Anything you can see
Anything that has mass and takes up space
Only solid objects
Only things that are heavy
Why is air considered matter even though you cannot see it?
Because it has color
Because it has mass and takes up space
Because it moves
Air is not matter
Which of the following is NOT matter?
Steam from boiling water
Helium in a balloon
Light from a lamp
Oxygen in the air
Is love considered matter? Why or why not?
Yes, because love is real
No, because love does not have mass or take up space
Yes, because you can feel love
No, because love is invisible
Which of the following is NOT matter?
Air
Water
Thoughts
Steam
Which of the following is an observable property?
Mass
Volume
Texture
Temperature
Which of the following is a measurable property?
Color
Shininess
Mass
Texture
What makes a property 'measurable' instead of 'observable'?
You can see it with your eyes
You use tools and get numbers with units
You can feel it with your hands
It changes over time
A scientist describes an object as 'rough, gray, and not magnetic.' These are all examples of:
Measurable properties
Observable properties
Chemical properties
Physical changes
Which word describes texture?
Red
Shiny
Smooth
Magnetic
Which of the following is an observable property?
Temperature
Length
Color
Volume
Which of the following is a measurable property?
Texture
Shininess
Temperature
Color
Two students are describing the same rock. Student A says it is 'heavy.' Student B measures it as '250 grams.' Which description is more useful for scientists?
Student A, because 'heavy' is easier to understand
Student B, because the measurement is precise and can be verified
Both are equally useful
Neither is useful
What tool do we use to measure mass?
Graduated cylinder
Ruler
Triple beam balance
Beaker
What tool do we use to measure volume of a liquid?
Triple beam balance
Graduated cylinder
Ruler
Thermometer
What unit does a triple beam balance measure in?
Milliliters (mL)
Centimeters (cm)
Grams (g)
Degrees (°)
What is volume?
How loud something is
The weight of an object
The amount of space something takes up
The temperature of an object
What is mass?
The amount of space something takes up
The temperature of an object
How stinky something is
The amount of matter in an object
Why are observable properties useful to scientists?
They are the only properties that matter
They help identify and describe objects without special equipment
They are more important than measurable properties
They never change
What is texture?
Whether something reflects light
What you see with your eyes
How something feels
Whether it sticks to a magnet
In a solid, particles are:
Far apart and moving fast
Close together and vibrating in place
Spread out and sliding past each other
Unable to move at all
In a gas, particles are:
Very close together and vibrating
Close together and sliding past each other
Far apart and moving fast in all directions
Not moving at all
In a liquid, particles are:
Far apart and moving fast
Very close together and fixed in place
Close together and can slide past each other
Not moving at all
Why can liquids take the shape of their container but solids cannot?
Liquid particles can slide past each other; solid particles are fixed in place
Liquids have no particles
Solid particles move faster than liquid particles
Liquids are always lighter than solids
Which state of matter has particles that are very close together and vibrate in fixed positions?
Solid
Liquid
Gas
Plasma
Which state of matter has particles that are far apart and move quickly in all directions?
Solid
Liquid
Gas
All of the above
When matter is heated, the particles:
Move slower
Move faster
Stop moving
Get bigger
When matter is cooled, the particles:
Move faster
Move slower
Disappear
Get larger
Which has faster-moving particles: ice water or boiling water?
Ice water
Boiling water
They move at the same speed
Neither has moving particles
A student puts food coloring in cold water and hot water at the same time. In which water will the food coloring spread faster?
Cold water
Hot water
They will spread at the same rate
Neither will spread
Diffusion is when particles:
Stop moving completely
Spread out and mix because they bump into each other
Get larger in size
Change from solid to liquid
When salt dissolves in water, what happens to the salt particles?
They disappear completely
They break apart into smaller particles that spread throughout the water
They turn into water
They get bigger
You spray air freshener in one corner of a room. A few minutes later, someone across the room can smell it. This is an example of:
Dissolving
Diffusion
Freezing
Condensation
Food coloring spreads in hot water faster than in cold water. What does this tell us about particles?
Hot water has more particles
Particles move faster at higher temperatures
Cold water has no particles
Temperature doesn't affect particles
What is the difference between dissolving and diffusion?
They are the same thing
Dissolving is when a solid breaks apart; diffusion is particles spreading out
Diffusion only happens in solids
Dissolving only happens in gases
Why does food coloring spread faster in hot water than cold water?
Hot water has more particles
Particles in hot water move faster and bump into the food coloring more often
Cold water is denser
Food coloring dissolves better in cold water
All matter is made of tiny particles called:
Molecules
Atoms
Cells
Elements
Which statement about particles in matter is TRUE?
Particles only move in gases
Particles are always moving, even in solids
Particles stop moving when matter is frozen
Only liquid particles move
A material keeps its shape no matter what container you put it in. This material is most likely a:
Gas
Liquid
Solid
Plasma
A material spreads out to fill the entire container and has no definite shape or volume. This material is most likely a:
Solid
Liquid
Gas
All of the above
An element is made of:
Two or more types of atoms bonded together
Only one type of atom
Only molecules
A mixture of different substances
Why are elements found on the periodic table but compounds are not?
Compounds are not real
The periodic table only organizes pure substances made of one type of atom
Compounds are too big
There are too many compounds to list
What element has the symbol 'Au'?
Silver
Aluminum
Gold
Argon
What is the symbol for Nitrogen?
Ni
Na
N
Ne
An element has an atomic number of 6. What element is it?
Oxygen
Carbon
Nitrogen
Helium
What element has the symbol 'Fe'?
Fluorine
Iron
Fermium
Francium
What element has the symbol 'Ag'?
Gold
Aluminum
Silver
Argon
What is the symbol for Potassium?
P
Po
Pt
K
A compound is made of:
Only one type of atom
Different types of atoms bonded together
Atoms that are not bonded
Only gases
How many hydrogen atoms are in one molecule of H₂O?
1
2
3
4
How many TOTAL atoms are in one molecule of CO₂?
2
3
4
5
How many oxygen atoms are in one molecule of CO₂?
1
2
3
4
The formula O₂ represents:
A compound because there are 2 atoms
An element because all atoms are the same type
A mixture
A molecule of water
How many elements are in the compound NaCl?
1
2
3
4
How many TOTAL atoms are in one molecule of CH₄?
2
4
5
6
When elements combine to form a compound, the compound's properties are:
The same as the elements that made it
A blend of the elements' properties
Completely different from the elements
Always more dangerous
Sodium is a metal that explodes in water. Chlorine is a poisonous gas. When they combine, they form table salt (NaCl). Why is table salt safe to eat?
The sodium and chlorine disappear
When elements bond, the compound has completely different properties
Salt is only a little bit dangerous
Salt still has some poison in it
H₂O (water) is safe to drink, but H₂O₂ (hydrogen peroxide) can burn your skin. Why do they have such different properties?
They have the same properties
The different number of oxygen atoms changes the properties completely
Water is older than hydrogen peroxide
Hydrogen peroxide has more hydrogen
Hydrogen is a gas that explodes. Oxygen is a gas that makes fire bigger. When they bond to form water (H₂O), water puts out fire. This shows that:
Compounds have the same properties as their elements
Compounds have completely different properties than their elements
Water is not really made of hydrogen and oxygen
Fire is not affected by water
Which of the following is a COMPOUND?
O₂
Fe
H₂O
N₂
