Practice Test 9 - 3rd Grade Science
19 questions. Answer them in any order, then submit to see your score and every explanation.
- Chen observed a tropical rainforest with temperatures 80–90°F, daily rain, very humid air, tall trees, thick plants, and lots of fruit. He saw 3 monkey groups with many babies and watched them eat fruit each day. He also counted 30 tree frogs calling at night and found tadpoles in small water pockets on trees. A desert cactus brought in turned yellow, and its roots became soft and rotted after a week of wet soil. Based on the evidence, what makes monkeys and tree frogs able to survive when the cactus cannot?
- Read about the bird feeder design. Emma's feeder should work in the school garden. It must hold enough seeds for multiple birds, protect seeds from rain, and be easy to refill weekly. What are the specific requirements for this solution to work well?
- In Kansas during spring, Marcus sees dark, rotating clouds and hears a tornado siren. A narrow path of extremely strong wind can destroy houses, knock down trees, and turn broken pieces into flying debris. People hurry to a safe shelter because it can happen fast. What makes this weather hazard dangerous?
- Sofia used a website and notes; what is typical for the Amazon climate?
- Jamal has April highs (Week 1: 45–55°F ... Week 4: 70–76°F); what should axes be?
- A class grew 20 sunflowers. Heights range 140–180 cm. What varies?
- A pendulum swings back and forth, and students count swings each minute for five minutes. They also time each minute in seconds to be exact. They want to see if the number of swings changes over time. How should students record?
- A cabinet door swings open. How does the magnetic property of attraction help solve it?
- Read about the design: Chen builds a popsicle-stick bridge. Where could it fail?
- In the salty ocean with waves and kelp, which organism cannot survive?
- A grade has 60 students going to a museum 15 miles away. They need transport under $200, reasonable travel time, and not too hard to organize. Option A: 3 school buses, costs $0, 45 minutes, set time. Option B: 15 parent cars, costs $0, 30 minutes, but hard to coordinate. Option C: 1 charter bus, costs $300, 35 minutes. Which solution offers the best balance of cost and ease?
- All are monarch butterflies (same species); what trait shows a range of variation?
- A ball bounces 100 cm, then 50 cm, then 25 cm high. What pattern do students observe?
- Near a pond, hundreds of fish turn together when a bird dives; what group behavior?
- Trilobite fossils show many legs and a hard shell; what can we learn?
- About the Sahara Desert: Source 1 temperature data (very hot days, cool nights), Source 2 precipitation records (under 3 inches a year), Source 3 satellite notes (few clouds, little vegetation). Using all sources, what is the climate like?
- Ms. Lee wants to display 20 papers on a metal board using magnets. What constraint must the solution follow?
- A fossil tooth is sharp and pointed; what can scientists learn about its diet?
- Read about the situation. The school garden soil gets too dry between waterings, and plants droop. The garden club meets twice a week, but plants need water every day. Chen says, "The soil is dusty when we come back." The solution must be safe and use materials we already have. What do students need to design to solve this problem?