Year 9 Science • AC9S9H01 • Authored homework
How Science Is Validated
Explain how scientific knowledge is checked, challenged, validated and refined through evidence, peer review, repeated testing and collaboration. Use evidence and clear reasoning in longer answers.
Part A
Short-answer questions
What does it mean to validate scientific knowledge?
Why is repeated testing important before accepting a result?
What is peer review?
Explain the difference between a claim and evidence.
Why should a scientific method be described clearly?
How can new evidence refine an existing explanation?
Give one reason scientists may reject a result.
Why is uncertainty not the same as guessing?
What is a limitation of using one small data set?
Correct this misconception: “Once science proves something, it never changes.”
Part B
Long-answer questions
Describe the steps scientists use to check whether a new finding is reliable.
Explain how peer review can identify weaknesses in methods, data or conclusions.
Compare a claim supported by repeated evidence with a claim supported by one surprising result.
A student says changing an explanation means science failed. Write a response that explains why refinement can strengthen science.
Use an example from atoms, energy, body systems or the carbon cycle to show how evidence can refine scientific knowledge.
Explain why another scientist should be able to repeat an investigation before accepting the findings.
Describe how bias, poor sampling or uncontrolled variables can weaken a scientific conclusion.
Create a checklist for judging whether a scientific claim is well supported.
Explain how collaboration between scientists can improve the quality of evidence.
Evaluate a headline that makes a strong science claim. What extra information would you need before trusting it?
Part C
Research and understanding task
Research one case where scientific knowledge changed after new evidence, repeated testing or peer review. Explain the old idea, the new evidence and how the current explanation was validated.