Light & Eye
Light travels in a straight line until it hits an object. What happens to light when it hits a mirror?
Answer: Light reflects off the mirror.
Explanation: Mirrors bounce light back in a straight line.
A turtle has a hard shell. What function does the shell provide?
Answer: The shell protects the turtle from predators and injury.
A battery powers a light bulb. What type of energy transformation happens?
Answer: Chemical → electrical → light energy.
On a topographic map, contour lines that are close together show what? Steep or gentle slope?
Answer: Close contour lines = steep slope.
Wind blowing sand against a rock causes the rock to wear down. Is this weathering or erosion?
Answer: Weathering.
Explanation: Rock is being broken down.
The pupil gets larger or smaller depending on the amount of light. Why does the pupil get smaller in bright light?
Answer: The pupil gets smaller to limit the amount of light entering the eye.
Explanation: Too much light can damage the retina.
A bird has hollow bones and strong chest muscles. How do these structures help the bird survive?
Answer: Hollow bones make the bird lighter; chest muscles help it flap wings strongly.
A circuit has a battery, wires, and a bulb. What must be true for the bulb to light?
Answer: The circuit must be closed.
Explanation: Electricity must flow in a complete loop.
A topographic map shows a river flowing downhill. How can you tell which direction the river flows?
Answer: Rivers flow from higher elevation to lower elevation.
Explanation: Look for decreasing contour numbers.
A river carries sediment downstream. Is this weathering or erosion? Explain.
Answer: Erosion.
Explanation: Sediment is being moved.
A student shines a flashlight on a book. The shadow changes size when the flashlight moves. Explain why the shadow gets bigger when the light source gets closer.
Answer: The shadow gets bigger because the light source covers more of the object’s surface area.
Explanation: When the light is closer, the object blocks more light.
A desert fox has large ears. Explain how this structure helps the fox survive in a hot environment.
Answer: Large ears help release heat.
Explanation: More surface area = better cooling.
A student builds a circuit but the bulb does not light. Identify two possible reasons and explain how to fix them.
Answer: Possible reasons: loose wire, dead battery, open circuit.
Explanation: Fix by tightening connections or replacing battery.
A community is building homes near a steep slope. Use the topographic map to explain one natural hazard they should prepare for.
Answer: Landslides are a risk.
Explanation: Steep slopes + gravity = unstable ground.
A farmer notices soil disappearing from a field after heavy rain. Explain how both weathering and erosion are involved.
Answer: Weathering breaks soil apart; erosion carries it away.
A student claims, “We see objects because our eyes send out light.” Use evidence to argue whether this claim is correct or incorrect.
Answer: The claim is incorrect.
Explanation: Eyes do not send out light; they receive reflected light from objects.
Two animals live in the same habitat: a frog and a fish. Compare how their structures help each survive in water.
Answer: Frogs use lungs and skin to breathe; fish use gills.
Explanation: Both structures support survival in water but in different ways.
A solar panel powers a fan. Explain the energy transformations from sunlight to moving air.
Answer: Sunlight → electrical energy (solar panel) → mechanical energy (fan blades).
Explanation: Energy changes form to do work.
A hurricane is approaching a coastal town. Explain how topographic features could increase or decrease the impact of flooding.
Answer: Low‑lying areas flood more; higher elevations flood less.
Explanation: Topography controls water movement.
Two rocks are found: one smooth and rounded, one jagged and sharp. Use evidence to explain which rock experienced more erosion.
Answer: The smooth rock experienced more erosion.
Explanation: Water or wind wore it down over time.
A model of the eye shows the cornea, lens, retina, and optic nerve. Explain how these structures work together to help us see an object placed in front of us.
Answer: Light enters through the cornea → lens focuses the image → retina receives the image → optic nerve sends signals to the brain.
Explanation: All structures work together to form a clear picture.
A scientist observes that a certain plant species is dying after a drought. Use evidence to argue how the plant’s structures may not be adapted for this environment.
Answer: The plant likely lacks drought‑resistant structures like deep roots or waxy leaves.
Explanation: Without these, it cannot store or conserve water.
A student claims that adding more batteries always makes a bulb brighter. Use evidence from circuits to support or refute this claim.
Answer: Not always true.
Explanation: Too many batteries can burn out the bulb or exceed its voltage limit.
A scientist compares two locations: one with steep mountains and one with flat plains. Predict which area is more at risk for landslides and justify your reasoning using map evidence.
Answer: Mountains have higher landslide risk. Explanation:
Steep slopes + loose material = more movement.
A construction company wants to build a road through an area with loose sediment and steep slopes. Predict the challenges they may face and explain how weathering and erosion could affect the road over time.
Answer: The road may collapse or crack.
Explanation: Loose sediment + steep slopes = erosion and landslides.