Science Inquiry and Application
Science Inquiry and Application on the Grade 5 OST asks you to design fair tests, read data, and support claims with evidence. Questions may show a data table or graph and ask what can be concluded.
Core rules and concepts
- A testable question names what will be changed and measured. A hypothesis is a prediction based on prior knowledge, not a guess with no reason.
- In a controlled experiment, change one independent variable, measure the dependent variable, and keep all other variables constant. A control group provides a comparison.
- Repeat trials to reduce the effect of random error. Use the mean of trials and check for outliers.
- Observations come from senses or instruments; inferences are explanations based on observations. A model represents a real system and has limits.
- A graph should match the data: bar graphs compare categories, line graphs show change over time, and the scale must be consistent.
- A strong conclusion states a claim, cites specific data, and notes whether the evidence supports the hypothesis. Engineering design uses criteria, constraints, prototypes, and testing.
Worked example
Students grow bean plants under red, blue, and white light for 3 weeks, measuring height. They keep water, soil, and temperature the same. Reasoning: light color is the independent variable; plant height is dependent; water, soil, and temperature are controlled. If blue-light plants are tallest, the evidence supports more growth under blue light, but only for this setup. Repeating trials strengthens the claim.
Traps that cost marks
- Changing two variables and still calling it a fair test.
- Writing that the hypothesis is proven instead of supported.
- Reading a graph without checking the scale or units.
- Treating an inference as a direct observation.
- Using a single trial as conclusive.