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Science Review

Grade 4 · On-level practice · 10 questions · Version PG-1K4RPWI-102C

1.

Why do seasons occur?

2.

What is the role of chlorophyll?

3.

What evidence shows a chemical reaction occurred?

4.

Why are food webs more realistic than single food chains?

5.

State Newton's third-law force pair when swimming.

6.

What is density?

7.

What type of boundary forms when plates move apart?

8.

What does conservation of energy mean?

9.

What is the pH of a neutral solution?

10.

How do greenhouse gases warm Earth?

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 12
  1. Why do seasons occur?Earth's tilt as it orbits the Sun
  2. What is the role of chlorophyll?Absorb light for photosynthesis
  3. What evidence shows a chemical reaction occurred?New substances form
  4. Why are food webs more realistic than single food chains?Organisms have multiple food sources and predators
  5. State Newton's third-law force pair when swimming.Push water back; water pushes swimmer forward
  6. What is density?Mass per unit volume
  7. What type of boundary forms when plates move apart?Divergent boundary
  8. What does conservation of energy mean?Energy changes form but is not created or destroyed
  9. What is the pH of a neutral solution?7
  10. How do greenhouse gases warm Earth?They absorb and re-emit infrared energy

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.