Year 8 Science · Unit 4 · Lesson 15

Unit 4 Synthesis — Working Scientifically

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Learning Goals

Identify the odd one out in groups of scientific concepts spanning all unit themes.
Apply data, graph, and CER skills to a realistic CSIRO-style ecological scenario.
Evaluate a validity threat in a real-world investigation design.

Warm Up

Odd one out

Circle the item that does not belong in each group. Then explain in the answer column why it does not fit.

#	Group	Odd one out + reason
1	height mass colour temperature
2	bar graph line graph scatter plot data table
3	random error systematic error parallax error correlation
4	Introduction Method Results Hypothesis
5	independent variable dependent variable controlled variable abstract

Your Turn

Synthesis scenario

Real-world context

A scientist at CSIRO in Canberra investigates whether native plant species survive longer than exotic (introduced) species during drought conditions. They measure the survival rate (%) for 10 species of each type over 30 days without rainfall in controlled outdoor plots.

(a) Describe how the scientist should structure a data table for this investigation. Include column headings and explain what units to use.

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(b) Choose and justify the most appropriate graph type for comparing native vs exotic survival rates. Explain why the other main option is less suitable.

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(c) Write a CER conclusion using these results: native species showed 78% average survival; exotic species showed 41% average survival. Use the terms "claim", "evidence" and "reasoning" in your response.

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(d) Evaluate one threat to the validity of this investigation design. Explain why it is a problem and how it could be reduced.

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Wrap Up

In one sentence, why do scientists need all four skills — data collection, graphing, error analysis, and communication — to produce reliable findings?