Practice Test 7 - 3rd Grade Science
19 questions. Answer them in any order, then submit to see your score and every explanation.
- Read about the test: Amir tests if fertilizer helps bean plants grow. All plants get 50 mL water daily and sit in the same window. The test variable is the fertilizer type. Which shows something that could make the test unfair?
- Moth: egg→larva(caterpillar)→cocoon→adult. Beetle: egg→larva→pupa→adult. What is one difference?
- A class tested 3 bedding materials for a hamster. Wood shavings: smell rating 9/10, costs $8, soft. Paper bedding: smell rating 6/10, costs $6, very soft. Shredded paper: smell rating 3/10, costs $0, somewhat soft. Criteria: smell rating 7+ and costs under $7, and comfortable. Which bedding best meets the criteria?
- Look at the problem. Students want to read library books during recess outside, but they worry books will get dirty or wet. Keisha says, "I love reading outside, but I don't want to ruin the book." The solution must fit in a backpack and use only free or recycled materials. Which sentence best describes the problem that needs a solution?
- A wetland had frogs, ducks, fish, and cattails. After farmers drained the water, what happened to the plants and animals?
- Look at the garden club project. Students must make 20 plant markers to label vegetables. They may use only popsicle sticks, markers, and clear tape from the art closet, and they cannot buy anything new. They have 45 minutes. Which statement lists the constraints on materials, time, or cost?
- In tug-of-war, the rope moves toward Team Red. Are forces balanced?
- Read about the paper bridge challenge. Limits: only 10 sheets of paper and tape; no glue; finish in 20 minutes; teacher provides materials. What rules must students follow about materials, time, or money?
- A class wants a pet active during school, easy care, and interactive. Option A: hamster (active in day, cheap food, clean weekly, can be held). Option B: fish (seen all day, feed daily, clean monthly, cannot be held). Option C: hermit crab (hides often, special food, easy care, can be held). Which solution is most promising?
- In a frog pond, females move toward louder calls and ignore quieter calls. Based on the observations, which males are more successful at reproducing?
- A mechanic drops steel bolts in tight spaces. What must the magnetic solution be able to do?
- A toy car goes 30 cm, 60 cm, 90 cm, 120 cm. Predict the next distance.
- Horse: born→foal→adult→has foals→old; Eagle: egg→chick→adult→lays eggs; Pumpkin plant: seed→sprout→vine→makes seeds→dies. What happens in every organism's life cycle?
- Lost and found items are piling up. The school needs a system that is quick to use, helps people find items, and does not take too much space. Plan A: 4 labeled bins, takes 5 minutes to sort, easy to find things. Plan B: 1 big box, takes 1 minute to sort, hard to find items. Plan C: 50 hooks with a log book, takes 10 minutes per item, very organized. Which solution best meets the school's needs?
- Scientists found a fish fossil in rocks far from the ocean. What does this tell us?
- Carlos observed a pond with native fish and water plants. After someone released non-native fish into the pond, what effect did this have on populations?
- Amir is choosing bedding for a class hamster. Criteria: smell rating 7+ out of 10, costs under $7 per month, and is comfortable. Wood shavings: 9/10, $8, soft. Paper bedding: 6/10, $6, very soft. Shredded paper: 3/10, $0, somewhat soft. Which bedding best meets the criteria?
- With 1 magnet, 5 paperclips lifted; with 3 stacked magnets, 18 lifted. Why did more paperclips lift?
- Look at the different ideas. Strong wind keeps knocking over bean seedlings in cups. Solution 1: build a cardboard windbreak wall. Solution 2: place rocks around each cup. Solution 3: tie cups together in groups. Which describes different approaches to solving this design challenge?