Ecosystems & Populations
Which term describes all the living and nonliving things in an area?
a. habitat
b. population
c. community
d. ecosystem
e. ecosystem
An ecosystem includes both living and nonliving components interacting in an environment.
Which object in our solar system produces its own light?
A. The Moon
B. The Sun
C. Earth
D. Jupiter
B. The Sun
The Sun is a star, and stars produce their own light.
Which of the following describes motion?
A. The color of an object
B. A change in position over time
C. The weight of an object
D. A force that pushes objects
B — A change in position over time
Motion means something is moving from one place to another.
Light travels in:
A. Straight lines
B. Circles
C. Random directions
D. Curved paths
A. Straight lines
Light moves in straight paths unless reflected or refracted.
Sound is created by:
A. Vibrations
B. Heat
C. Gravity
D. Light waves
A. Vibrations
Sound begins when something vibrates and creates waves.
A group of the same species living in the same place is called a:
a. community
b. biome
c. population
d. ecosystem
c. population
A population is a group of the same species living in one area.
Earth orbits the Sun because of:
A. Friction
B. Magnetism
C. Wind
D. Gravity
D. Gravity
The Sun’s gravity pulls Earth into its orbit.
A force that slows objects down when they rub together is called:
A. Friction
B. Electricity
C. Gravity
D. Magnetism
A. Friction
Friction resists motion and creates heat when surfaces rub.
A material that does NOT let light pass through is:
A. Translucent
B. Transparent
C. Reflective
D. Opaque
D. Opaque
Opaque materials block all light.
Sound travels fastest through:
A. Solids
B. Water
C. A vacuum
D. Air
A. Solids
Particles in solids are close together, allowing sound to move quickly.
What is the main source of energy for most ecosystems?
A. Water
B. The Sun
C. Wind
D. The Moon
B. The Sun
The Sun provides energy for plants, which start most food chains.
Which planet is known for its rings?
A. Saturn
B. Mars
C. Venus
D. Mercury
A. Saturn
Saturn has the largest and most visible ring system.
Which tool measures how fast something is moving?
A. Compass
B. Thermometer
C. Barometer
D. Speedometer
D. Speedometer
A speedometer shows speed, usually in vehicles.
A mirror works because it:
A. Bends light
B. Blocks light
C. Reflects light
D. Absorbs light
C. Reflects light
Mirrors reflect light back, allowing you to see your image.
The loudness of a sound is called its:
A. Pitch
B. Volume
C. Frequency
D. Echo
B. Volume
Volume describes how loud or soft a sound is.
Which of the following is a consumer?
A. Grass
B. Oak tree
C. Mushroom
D. Fern
C. Mushroom
Mushrooms cannot make their own food; they break down dead organisms for energy.
What causes day and night on Earth?
A. Earth rotating on its axis
B. Clouds covering the sky
C. The Moon blocking sunlight
D. Earth orbiting the Sun
A. Earth rotating on its axis
As Earth spins, different parts face the Sun (day) or turn away (night).
If you push a ball harder, it will:
A. Move faster
B. Not move at all
C. Move slower
D. Change color
A. Move faster
More force causes greater acceleration.
Which tool separates white light into colors?
A. Prism
B. Thermometer
C. Scale
D. Magnet
A. Prism
A prism refracts (bends) light into a rainbow of colors.
A high‑pitched sound has:
A. Random frequency
B. High frequency
C. Low frequency
D. No frequency
B. High frequency
High pitch comes from fast vibrations.
Which change would most likely decrease a population of rabbits?
A. More grass grows
B. More shelter becomes available
C. More predators move in
D. Rain increases
C. More predators move in
Predators reduce prey populations by eating them.
Which phase of the Moon occurs when the Moon is completely dark?
A. New Moon
B. First Quarter
C. Full Moon
D. Waxing Crescent
A — New Moon
During a New Moon, the side facing Earth is not lit by the Sun.
Which of the following is an example of balanced forces?
A. ball rolling downhill
B. car speeding up
C. book resting on a table
D. rocket launching
C. book resting on a table
Balanced forces cancel out, causing no movement.
Which color of light bends the most when passing through a prism?
A. Green
B. Blue
C. Violet
D. Red
C. Violet
Violet has the shortest wavelength, so it bends the most.
Which object would make the lowest pitch?
A. A tiny bell
B. A short guitar string
C. A small tuning fork
D. A large drum
D. A large drum
Larger objects vibrate more slowly, producing lower pitches.