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Science Investigation Questions

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Science Investigation Questions

A community garden is wilting, and the garden team wants to find out why. Use the investigation clues and your own ideas to write questions that can be tested fairly. Answer in complete sentences where needed.

Spot a testable question

A testable question connects something you change with something you can observe or measure.

1.Which question could the garden team investigate by growing seedlings and measuring them?

Which seedling looks nicest?
How does the amount of water each seedling gets affect its height after two weeks?
Why are plants important to people?
What is the best plant in the garden?

2.Amira notices that seedlings near the fence are taller than seedlings near the path. Write one testable question based on this observation.

3.A student asks, “What is the best way to look after a plant?” Explain why this is difficult to investigate as written, then improve it by making it specific and measurable.

Plan a fair test

A fair test changes one factor at a time and keeps other conditions the same.

4.The garden team tests whether water amount affects seedling height. Which factor should they change on purpose?

The amount of water each seedling receives
The type of seed used for each pot
The measuring ruler
The length of time each seedling is grown

5.Name two things the team should keep the same to make this a fair test.

6.The team gives one seedling 20 mL of water daily and another 60 mL daily. They use the same seed type and pot size, but put one pot in full sun and the other in shade. What makes this test unfair, and how could they fix it?

7.Put these investigation steps in a sensible order by writing the letters: A. Record and compare results. B. Ask a testable question. C. Plan a fair test. D. Share what you found. E. Carry out the test.

Read the results

Three groups grew the same kind of seedling for 14 days. Each pot had the same soil and sunlight. Their average heights were: 20 mL water per day — 4 cm; 40 mL per day — 8 cm; 60 mL per day — 6 cm.

Water each day

20 mL

40 mL

60 mL

Average height

4 cm

8 cm

6 cm

8.Which water amount produced the tallest seedlings? How much taller were they than the seedlings given 20 mL per day?

9.Complete the conclusion: “In this test, seedlings given mL of water each day grew tallest. The results suggest that …”

10.Why should the team repeat the test with more seedlings before making a strong claim?

11.Choose a familiar material, object or living thing. Write a focused investigation question about it, then name one thing you would change and one result you would measure.