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Science Review

Grade 5 · On-level practice · 10 questions · Version PG-REK95C-1AF4

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1.Why are food webs more realistic than single food chains?
2.Why do seasons occur?
3.Which blood cells fight infection?
4.What type of boundary forms when plates move apart?
5.What is the difference between weather and climate?
6.What evidence shows a chemical reaction occurred?
7.Which layer of Earth is liquid iron and nickel?
8.What cell structure contains genetic material?
9.What is the pH of a neutral solution?
10.State Newton's third-law force pair when swimming.

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 15
  1. Why are food webs more realistic than single food chains?Organisms have multiple food sources and predators
  2. Why do seasons occur?Earth's tilt as it orbits the Sun
  3. Which blood cells fight infection?White blood cells
  4. What type of boundary forms when plates move apart?Divergent boundary
  5. What is the difference between weather and climate?Weather is short-term; climate is long-term patterns
  6. What evidence shows a chemical reaction occurred?New substances form
  7. Which layer of Earth is liquid iron and nickel?Outer core
  8. What cell structure contains genetic material?The nucleus
  9. What is the pH of a neutral solution?7
  10. State Newton's third-law force pair when swimming.Push water back; water pushes swimmer forward

Worked example

Connect the question to an observable process or scientific model.

Common mistake

Selecting a familiar term without checking its meaning.

Helpful hint

Explain why your answer makes sense.