Year 8 Science • AC9S8I01 • Authored homework
Ask Questions Science Can Test
Develop investigable questions, reasoned predictions and hypotheses that can be tested using evidence. Focus on measurable variables, fair testing and the difference between correlation and causation.
Part A
Short-answer questions
What makes a science question investigable?
Rewrite this question so it can be tested: “Which fertiliser is best?”
What is an independent variable?
What is a dependent variable?
What is a controlled variable?
What is a hypothesis?
How is a prediction different from a hypothesis?
Why should a testable question include something measurable?
What is the difference between correlation and causation?
Write one investigable question about plant growth, dissolving, energy transfer or reaction rate.
Part B
Long-answer questions
Turn the topic “salt solution and plant cells” into an investigable question, then identify the independent variable, dependent variable and two controlled variables.
Write a reasoned hypothesis for an investigation into how surface area affects dissolving speed. Explain the science behind your hypothesis.
A student asks, “Do students who sleep more get higher test scores?” Explain why this question may show correlation but does not automatically prove causation.
Compare two questions: one that is too broad for a school investigation and one that is suitable. Explain why the suitable one is better.
Design three predictions for the same investigation: one expected result, one unexpected result and one result that would show no relationship.
Explain why “Does temperature affect reaction speed?” is better than “What happens when chemicals react?” for an investigation.
Create an investigable question about energy transfer. Include measurable variables and a clear relationship to test.
A student predicts that increasing light will always make plants grow faster. Explain why this prediction may need limits or controlled conditions.
Choose a claim from everyday life and turn it into a testable science question. Explain what evidence would be needed.
Write a full investigation aim, question, hypothesis and prediction for a fair test you could safely conduct in class.
Part C
Research and understanding task
Research a simple school-safe investigation idea from a reliable education or science source. Rewrite it as your own investigable question, identify the variables, and explain why the question can be tested with evidence.