Unit 1
A river carries sediment and drops it at its mouth, forming new land. Which BEST explains this process?
C. Deposition builds up land
A plant has needles and produces cones instead of flowers. How should it be classified?
gymnosperm
Which microorganism is MOST likely helpful in making yogurt?
A. Virus
B. Bacteria
C. Fungus
D. Protist
B. Bacteria
In which circuit will all bulbs go out if one bulb is removed?
series
Ice melting into water is which type of change and why?
B. Physical, state changes only
A student says a canyon was formed only by weathering. Why is this incorrect?
A. Weathering only moves sediment
B. Erosion must also carry sediment away
C. Deposition breaks rocks into pieces
D. Gravity prevents canyon formation
B. Erosion must also carry sediment away
Two animals both have fur, give birth to live young, and feed milk. Which classification is BEST?
mammal
A student gets the flu from a virus. Why are antibiotics NOT helpful?
A. Antibiotics only kill fungi
B. Antibiotics only kill bacteria
C. Antibiotics strengthen viruses
D. Antibiotics increase immunity
B. Antibiotics only kill bacteria
A material allows electricity to pass through easily. What is it?
conductor
Which observation BEST shows a chemical change?
A. Cutting paper
B. Melting wax
C. Bubbles forming in a reaction
D. Freezing water
C. Bubbles forming in a reaction
A farmer plants grass to stop soil from washing away during rainstorms. Which process is the farmer trying to reduce?
C. Erosion
A student groups whales with fish because they live in water. Why is this incorrect?
A. Whales have scales
B. Whales lay eggs
C. Whales breathe air and nurse young
D. Whales have gills
C. Whales breathe air and nurse young
Which BEST explains why fungi are important to ecosystems?
A. They produce sunlight
B. They break down dead organisms
C. They cause diseases
D. They store oxygen
B. They break down dead organisms
A student builds a circuit but the bulb does not light. Which is the MOST likely reason?
A. The circuit is closed
B. The battery is connected correctly
C. The circuit is open
D. The wires are conductors
C. The circuit is open
A student mixes two liquids and the temperature increases. What does this suggest?
A. Physical change
B. Chemical change
C. No change
D. Mixture only
B. Chemical change
Two areas experience the same rainfall, but one has plants and one does not. Which will have MORE erosion and why?
A. Area with plants because roots loosen soil
B. Area with plants because water flows faster
C. Area without plants because soil is unprotected
D. Area without plants because roots hold soil together
C. Area without plants because soil is unprotected
An animal is cold-blooded, lays eggs, and has dry scales. Which group does it belong to?
reptiles
A microorganism lives in water and can make its own food like a plant. What is it MOST likely?
A. Virus
B. Bacteria
C. Algae (protist)
D. Fungus
C. Algae (protist)
Why are metals commonly used in wires?
A. They block electricity
B. They attract magnets
C. They allow electrons to move easily
D. They produce electricity
C. They allow electrons to move easily
Which scenario is a physical change, even though it looks different?
A. Burning wood
B. Rust forming
C. Dissolving sugar in water
D. Cooking an egg
C. Dissolving sugar in water
A delta forms where a river meets an ocean. Which combination of processes is MOST responsible?
A.Weathering and gravity
B. Erosion and deposition
C. Deposition and evaporation
D. Weathering and condensation
B. Erosion and deposition
A plant cannot grow tall because it lacks tubes to transport water. Which explains this?
A. It is vascular
B. It is nonvascular
C. It is deciduous
D. It is a gymnosperm
B. It is nonvascular
Which statement BEST compares bacteria and viruses?
A. Both are living and can reproduce alone
B. Bacteria are living, viruses need a host
C. Viruses are larger than bacteria
D. Both can be killed with antibiotics
B. Bacteria are living, viruses need a host
An electromagnet stops working when the battery is removed. Why?
A. Magnets need heat
B. Electricity creates the magnetic field
C. The wire loses mass
D. The battery blocks magnetism
B. Electricity creates the magnetic field
A student says dissolving is always a chemical change. Why is this incorrect?
A. Dissolving creates gas
B. Dissolving forms a new substance
C. Dissolving does not change the substance’s identity
D. Dissolving requires heat
C. Dissolving does not change the substance’s identity