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WorksheetsMidterm Review
Total questions: 150
Worksheet time: 3hrs 38mins
Which statement best defines gravity for objects with mass?
A sideways force from planetary rotation
A pushing force created by moving objects
A magnetic force from charged particles
A pulling force between objects with mass
Why do planets orbit the Sun instead of flying off into space?
The Sun’s gravity keeps them in curved paths
Solar wind pushes planets around the Sun
Planets spin and create inward pressure
Space has no forces acting on planets
Describe how mass affects gravitational pull between two objects.
A student says, "Planets move because gravity pushes them." What correction should you provide?
Which pair of factors primarily determines the strength of gravitational attraction between two bodies?
Temperature and composition
Speed and direction of motion
Size and color of the bodies
Mass and distance between them
Which statement about inner versus outer planets is most accurate?
Gravitational pull depends on mass and distance
The Sun pulls harder on smaller inner planets
Outer planets feel no gravity from the Sun
Gravity depends only on a planet’s size
Explain why astronauts feel weightless even though space has gravity.
A moon orbits a planet. What is the main reason for this orbit?
Solar wind pushes the moon forward
Magnetism between rocky surfaces
The moon’s rotation makes it spiral
The planet’s gravity attracts the moon
What force keeps planets in orbit around the Sun and moons in orbit around planets?
Magnetism between space objects
Gravity acting between masses
Friction in empty space
Electricity from the Sun
Why does the Sun exert the strongest gravitational pull in our solar system?
It has the most mass of all objects
It is closest to Earth on average
It spins faster than the planets
It is the hottest star nearby
A moon orbits a planet primarily because—
The moon pushes the planet forward
The moon is larger than the planet
The Sun pushes the moon sideways
The planet pulls the moon with gravity
What happens to gravitational pull as the distance between two objects increases?
It disappears instantly beyond space
It decreases as separation grows
It stays about the same always
It increases steadily with distance
Which object would typically have the weakest gravitational pull?
A small asteroid in space
Earth compared to Jupiter
Jupiter among planets
The Sun in our system
Explain how gravity keeps both planets in orbit around the Sun and moons in orbit around planets. Include the roles of mass and distance in your explanation.
Which statement best explains how fossils provide evidence of Earth’s past?
They show exact ages of rock layers
They indicate only bones became fossils
They prove continents move quickly
They reveal preserved remains or traces
What does the Law of Superposition state about rock layers?
Older layers are always thicker
Younger layers lie above older layers
Younger rocks form first in all cases
Fossils only form in top layers
Which observation most supports continental drift?
Similar modern climates worldwide
Aligned time zones across oceans
Identical fossils across separate continents
Matching beaches on distant coasts
Plate tectonics best explains the formation of which feature?
Hurricanes in warm oceans
Mountains at convergent boundaries
Daily weather changes
Seasonal wind patterns
Relative age means—
An exact number of years
A comparison older or younger
A laboratory measured isotope date
A precise age in millions of years
Fossils of sea animals found high in mountains most likely indicate—
Mountains were once under water
Earth’s radius increased greatly
Continents never moved at all
All fossils form from bones
Explain how matching fossil types on widely separated continents provide evidence for continental drift.
A geologist finds a trilobite fossil in a lower rock layer and a plant fossil in an overlying layer. Using superposition, infer the relative ages of the fossils and explain your reasoning.
Which claim about plate movement is accurate?
Plates move centimeters per year
Plates shift thousands of miles monthly
Plates never change positions
Plates only move during earthquakes
Two rock layers contain similar index fossils, but one lies beneath the other. What is the most reasonable conclusion?
The upper layer formed first everywhere
The lower layer is relatively older
Both layers are exactly the same age
Neither layer contains useful evidence
Which evidence best supports that continents were once connected?
Matching world time zones
Same beaches on different continents
Identical fossils found across oceans
Similar climates across many regions
Which statement describes superposition?
Fossils only occur in top layers
Younger layers form first in sequence
Older rock layers are always thicker
Younger rocks are above older rocks
Which feature forms because of plate movement?
Strong global wind patterns
Seasonal weather changes yearly
Tall mountain ranges at boundaries
Powerful hurricanes over warm oceans
Fossils of sea animals on mountains show—
Earth grew larger over time
Mountains used to be underwater
Sea animals could climb high cliffs
Weather changed very quickly
What does plate tectonics explain?
Short-term weather conditions daily
Earth’s magnetic field behavior
Movement of Earth’s plates
How distant stars first formed
Describe TWO different types of evidence that show Earth has changed over time and explain how each supports this idea.
Which feature most likely forms at a divergent plate boundary?
Tall folded mountain ranges
Deep oceanic trenches
New crust at mid-ocean ridges
Large continental hot spot chains
At a convergent boundary where an oceanic plate meets a continental plate, what process and result are most typical?
Hot-spot melting forming shield volcanoes
Rifting creating new sea floor
Transform motion producing faults
Subduction leading to volcanic arcs
Which boundary is most associated with frequent shallow earthquakes without major crust creation or destruction?
Hot spot beneath a continent
Transform boundary sliding past
Divergent boundary at ridges
Convergent boundary with subduction
Explain how plate tectonics can create both mountains and ocean basins. Include the boundary types involved.
Which statement best distinguishes hot spots from plate boundary volcanoes?
Hot spots happen at transform faults
Hot spots are fixed mantle plumes
Hot spots occur only underwater
Hot spots form where plates collide
A student claims earthquakes only happen on land. Which evidence-based correction is most accurate?
Earthquakes are limited to continents
Earthquakes also occur beneath oceans
Earthquakes require mountain belts
Earthquakes strike only near volcanoes
Describe subduction and identify one geologic feature it can produce.
Match each boundary type to its typical result.
Divergent boundary creates new crust
Convergent boundary builds mountains
Transform boundary causes earthquakes
Subduction forms volcanic arcs
Which boundary creates new ocean crust?
Convergent
Transform
Divergent
Hot spot
Mountains form when—
plates collide
volcanoes erupt
plates slide
plates separate
Earthquakes mainly occur at—
all boundaries
hot spots
divergent boundaries
transform boundaries
Subduction produces—
hurricanes
trenches and volcanoes
mountains only
mid-ocean ridges
Hot spots form—
only at divergent boundaries
only at transform boundaries
away from plate boundaries
only underwater
Explain how different types of plate boundaries create different Earth features. Give at least two examples.
Which group starts the energy flow in most ecosystems by making food from sunlight?
Decomposers like fungi
Secondary consumers like foxes
Producers such as green plants
Primary consumers like rabbits
According to the 10% rule, if producers store 5,000 kilocalories, about how much energy is available to primary consumers?
50 kilocalories
500 kilocalories
1,000 kilocalories
5,000 kilocalories
Explain why energy decreases at higher trophic levels even though matter can cycle.
Which statement best describes decomposers in energy flow?
They recycle nutrients to soil
They receive the most energy
They create energy from heat
They stop energy loss
A food chain is grass → mouse → snake → hawk. Which organism receives the least available energy?
Mouse at primary consumer
Hawk at tertiary consumer
Snake at secondary consumer
Grass at producer level
If only 10% of energy transfers to the next level, what percent is lost as heat or used by organisms at each transfer?
About 25 percent
About 100 percent
About 10 percent
About 90 percent
Design a plan to estimate energy at each level of a pond food chain starting with 20,000 kilocalories in algae. Explain the reasoning for your calculations.
Which misconception is corrected by energy pyramids?
Energy flows from consumers to sun
Top predators get the most energy
Decomposers are optional in ecosystems
Nutrients never cycle through soil
Where does all energy in an ecosystem originally come from?
Soil
The Sun
Consumers
Plants
Which organism gets the MOST energy?
Hawk
Snake
Mouse
Grass
What percent of energy moves from producers to primary consumers?
100%
50%
10%
1%
Decomposers are important because they—
increase energy
recycle nutrients
store sunlight
create energy
Energy decreases at each trophic level because—
producers store all energy
organisms absorb too much heat
energy is lost as heat
food chains are too long
Explain how energy moves through an ecosystem and why energy decreases as it moves from one trophic level to the next.
Which process describes how matter moves in ecosystems?
Continuous creation from sunlight
Cyclic movement among organisms and environment
One-way transfer through trophic levels
Permanent storage in top consumers
Energy in an ecosystem moves in which pattern?
It is reused by decomposers
It increases at higher levels
It flows one way and decreases
It cycles like nutrients
What is the main role of decomposers in ecosystem sustainability?
Produce glucose for plants
Store sunlight in biomass
Recycle nutrients back to soil
Increase energy at each level
Which statement best explains why energy is not recycled in ecosystems?
Organisms convert energy into new atoms
Energy is lost as heat at each transfer
Decomposers return all energy to soil
Plants store energy forever in tissues
Identify the cycles that keep matter available to living things.
Light, sound, heat cycles
Oxygen, helium, neon cycles
Glucose, starch, lipid cycles
Carbon, nitrogen, water cycles
Explain how effective nutrient cycling supports ecosystem sustainability.
A forest loses most of its decomposers after a fire. Predict a likely outcome for the ecosystem.
Which factor would most reduce sustainability in a pond ecosystem?
Balanced food web with many producers
Disrupted nutrient cycle from pollution
Active decomposers returning nutrients
Continuous sunlight and nutrient cycling
What role do decomposers play in the cycling of matter?
They lose energy
They produce heat
They recycle nutrients
They make glucose
Which statement is TRUE about energy flow?
It cycles endlessly
It is reused
It flows one way
It increases at each level
The carbon cycle is important because—
volcanoes need carbon
hydrogen must be removed
it makes new elements
organisms need carbon to grow
Which factor would MOST decrease ecosystem sustainability?
Healthy decomposers
Plenty of sunlight
Balanced food web
Disrupted nutrient cycle
Matter cycles because—
it is reused
nutrients leave Earth
it is destroyed
energy becomes matter
Describe how energy flow and matter cycling work together to keep an ecosystem sustainable.
Which system primarily transports blood, oxygen, and nutrients throughout the body?
Nervous system sends electrical signals
Digestive system breaks down food molecules
Circulatory system moves blood and nutrients
Respiratory system moves air to lungs
What is the main function of the respiratory system?
Transport nutrients through the bloodstream
Release hormones to regulate processes
Exchange oxygen and carbon dioxide gases
Control body actions with nerve signals
Which system uses hormones to regulate body processes and help maintain homeostasis?
Endocrine system uses hormone signals
Nervous system uses electrical impulses
Respiratory system exchanges breathing gases
Digestive system uses chemical breakdown
Explain how the circulatory and respiratory systems work together to maintain homeostasis during exercise.
Which system is most responsible for breaking down food into nutrients the body can use?
Respiratory system exchanges gases
Digestive system processes food
Nervous system controls responses
Endocrine system releases hormones
A student claims the brain directly controls digestion. What correction best addresses this misconception?
Respiratory muscles digest carbohydrates
Endocrine system digests with hormones
Nervous system performs all digestion
Digestion is mostly muscular and chemical
Describe one way the nervous and endocrine systems differ in how they control the body.
Which pair of systems most directly collaborate to deliver oxygen from the environment to cells?
Digestive and endocrine systems
Respiratory and circulatory systems
Muscular and immune systems
Nervous and integumentary systems
Which system transports nutrients and oxygen?
Digestive
Endocrine
Circulatory
Nervous
The respiratory system works most closely with the—
circulatory
endocrine
nervous
muscular
Which system releases hormones?
Skeletal
Immune
Endocrine
Integumentary
Digestion begins in the—
liver
small intestine
mouth
stomach
The immune system protects the body by—
sending hormones
producing urine
fighting pathogens
moving oxygen
Describe how two human body systems work together to maintain homeostasis.
Asexual reproduction typically involves—
one parent; identical offspring
two parents; unique offspring
one parent; diverse offspring
two parents; identical offspring
Which process most increases genetic diversity in a population?
sexual reproduction with meiosis
cloning of a plant cutting
budding of hydra
binary fission in bacteria
Identify the common outcomes of asexual reproduction.
Which is an example of asexual reproduction?
pollination in flowers
budding in yeast
egg laying in birds
fertilization in mammals
A likely disadvantage of asexual reproduction is—
slow population growth
requires two parents to succeed
high genetic diversity
vulnerability to environmental change
Sexual reproduction results in offspring that are—
genetically identical to parents
genetically unique individuals
clones with no variation
produced rapidly each generation
Explain why sexual reproduction can improve long-term survival of a species.
Which statement best compares asexual and sexual reproduction?
Both increase diversity at equal rates
Asexual increases diversity; sexual is slower
Asexual is faster; sexual increases diversity
Sexual is faster and makes identical offspring
Asexual reproduction produces—
variation
identical offspring
two parents
no offspring
Which reproduction type increases genetic diversity?
Sexual
Asexual
Budding
Fission
A disadvantage of asexual reproduction is—
low diversity
need two parents
many mutations
slow reproduction
Which is an example of asexual reproduction?
Egg laying
Fertilization
Budding
Flowering
Sexual reproduction results in offspring that—
never mutate
are genetically unique
are clones
need one parent
Explain why sexual reproduction is more beneficial for long-term survival of a species than asexual reproduction.
Which statement best describes natural selection?
Organisms survive better with certain traits
Humans choose which traits become common
Individuals change their traits by wanting to
Traits appear instantly in a generation
What is the key difference between natural selection and artificial selection?
Natural changes individuals; artificial changes populations
Natural happens by human choice; artificial is random
Natural creates new traits; artificial removes mutations
Natural is driven by environment; artificial by humans
Define adaptation in one sentence.
Why is it incorrect to say an individual organism adapts during its lifetime?
Which example shows artificial selection?
Wolves hunting the weakest prey
Fish evolving fins over many generations
Birds migrating to warmer regions
Farmers breeding cattle for milk yield
Natural selection leads to adaptations because—
traits appear instantly after mutation
organisms choose their helpful traits
helpful traits increase survival and reproduction
humans breed for specific characteristics
A common misconception is that mutation and selection are the same. What distinguishes them?
Which statement about population vs. individual change is accurate?
Populations remain constant while individuals adapt
Individuals and populations change instantly
Populations change trait frequencies over generations
Individuals evolve new traits during life
Natural selection occurs when organisms—
change instantly
survive better with certain traits
are bred by humans
choose their traits
An example of artificial selection is—
farmers breeding cattle
fish evolving fins
wolves hunting
birds migrating
Adaptations occur because—
individuals change
traits appear instantly
organisms want new traits
the environment changes
Natural selection increases—
random traits
identical traits in all organisms
harmful traits
helpful traits
Artificial selection can lead to—
extinction always
increased variety
decreased variety
no change
Compare natural and artificial selection. Explain how each process changes the traits of a population.
Which statement best defines data in a scientific investigation?
Numbers recorded after an experiment
Information collected during an investigation
Opinions gathered from participants
Predictions made before testing
What is a scientific model used for in science?
To prove a hypothesis without data
To display only final conclusions
To represent a system or process
To replace real experiments completely
Why must explanations be evidence-based?
They simplify topics for younger students
They align conclusions with collected data
They avoid using any scientific terms
They make reports longer for grading
A group tests plant growth with different light colors. Their table shows plants under blue light grew the tallest. What explanation matches the data?
Blue light resulted in the greatest growth
Green light is always best for plants
Light color does not affect growth
Blue light harms plant growth overall
Which statement describes a limitation of models?
Models always give perfect predictions for systems
Models have boundaries and cannot capture everything
Models include every real-world detail exactly
Models are identical to the phenomena they represent
You design a model of the water cycle. How should you use it to build an explanation?
A class records temperatures every hour and graphs the data. What is the most appropriate next step to create a scientific explanation?
Replace the graph with a drawing of a thermometer
Ignore outliers to make the trend look smoother
State a conclusion based on personal experience
Describe patterns shown in the graph using evidence
A student claims, “My model proves the result.” What correction should you make?
Models require no comparison to evidence
Models provide representations, not proof
Models replace experiments completely
Models are proof; data are optional
Which statement is an evidence-based explanation?
I think plants grow better outside
Plants in sunlight grew 5 cm taller than plants in shade
A model is used to—
show a perfect copy of a system
represent and explain a system
Explanations must be based on—
beliefs
predictions
data
opinions
A limitation of a model is—
it cannot show everything
it is too large
it is too colorful
it never changes
Scientists revise explanations when—
they change their minds
new data is collected
Explain why scientific explanations must be supported by evidence and how models help scientists understand phenomena.
Which stage occurs first in a star’s life cycle?
Protostar forms from gas
Nebula collapses into stars
Main sequence stable phase
Red giant expands outward
What is the main sequence stage?
Brief explosive event
Stable period of fusion
Final cooling remnant
Early dust cloud stage
Blue stars compared to red stars are—
Older in age
Hotter in temperature
Cooler in temperature
Larger in radius
A low‑mass star typically ends as a—
Black hole remnant
White dwarf remnant
Neutron star remnant
Supernova remnant
Describe how the Hertzsprung–Russell (HR) diagram classifies stars and what two properties are compared.
Place these stages in order for a typical sun‑like star: red giant, nebula, white dwarf, protostar, main sequence.
Nebula → protostar → main sequence → red giant → white dwarf
Protostar → nebula → main sequence → white dwarf → red giant
Main sequence → protostar → nebula → red giant → white dwarf
Red giant → main sequence → protostar → white dwarf → nebula
Explain why not all stars become black holes.
On an HR diagram, where would a very bright but cool star likely appear?
Center main band
Upper right region
Upper left region
Lower right region
Stars form in—
nebulas
galaxies
asteroids
planets
A star spends most of its life as a—
black hole
red giant
main sequence star
supernova
Blue stars are—
hottest
coolest
smallest
dimmest
A low-mass star ends as a—
supernova
white dwarf
black hole
neutron star
The HR diagram compares—
height and weight
stars by temperature and brightness
Describe the stages of a star’s life and explain how the HR diagram is used to classify stars.
Which spheres interact with solar energy to create weather on Earth?
Atmosphere, hydrosphere, biosphere
Hydrosphere, lithosphere, biosphere
Atmosphere, hydrosphere, geosphere
Atmosphere, cryosphere, biosphere
What is the main reason convection currents form in air and water?
Even heating of Earth's surface
Uneven heating by the Sun
Rotation of the Moon around Earth
Differences in gravity between oceans
Define convection in the context of Earth systems.
Which statement best distinguishes weather from climate?
Weather describes short-term conditions; climate describes long-term patterns
Weather describes long-term patterns; climate is short-term conditions
Weather and climate mean the same thing
Climate only applies to oceans; weather applies to land
A coastal city experiences afternoon sea breezes most days. Which explanation best fits this pattern?
The Moon’s gravity pulls air from land to ocean each afternoon
Mountains block wind so air sinks over the sea daily
Ocean heats faster, pushing warm air toward land every afternoon
Land heats faster, causing air over land to rise and draw cool ocean air in
Explain how uneven solar heating leads to global wind belts.
Which process primarily drives ocean currents that move warm water toward higher latitudes?
Earth’s magnetic field interactions
Plate tectonics moving seafloor
Convection due to uneven solar heating
Photosynthesis increasing water temperature
A student claims the Sun heats Earth’s surface evenly everywhere. What consequence of this misconception would conflict with observations?
Volcanoes would erupt less often worldwide
There would be no global wind patterns or ocean circulation
Hurricanes would form more frequently near the poles
All regions would have identical climates year-round
