Starter quiz
- Plants produce glucose and ______ during photosynthesis.
- 'oxygen' ✓
- What is the role of chlorophyll in photosynthesis?
- absorb carbon dioxide
- absorb energy from light ✓
- absorb oxygen
- absorb water
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- What is the gas taken in by plants for photosynthesis?
- 'carbon dioxide' ✓
- In which cell organelle does photosynthesis occur?
- 'chloroplast' ✓
- What is the formula for glucose?
- C₂H₆O
- C₆H₁₂O₆ ✓
- H₂O
- CO₂
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- How can gas production be measured in photosynthesis experiments?
- using a pH meter
- using a ruler
- counting bubbles ✓
- using a thermometer
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Exit quiz
- What is the purpose of evaluating an experiment?
- to compare it with other experiments
- to confirm the results
- to identify errors and suggest improvements ✓
- to repeat the experiment exactly
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- What does precision in an experiment refer to?
- the closeness to the true value
- the spread of results around the mean value ✓
- the consistency of results by different groups
- the consistency of results by the same group
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- How can you improve the accuracy of gas measurement in photosynthesis experiments?
- use a ruler
- use a stopwatch
- use a gas syringe ✓
- use a thermometer
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- What does reproducibility in an experiment mean?
- obtaining different results by different people or groups
- obtaining different results by the same person or group
- obtaining similar results by different people using different equipment ✓
- obtaining similar results by the same person or group
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- How can systematic errors be identified in an experiment?
- by changing the experimental method
- by comparing results to known standards or controls ✓
- by ignoring outliers
- by repeating the experiment multiple times
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- How can you reduce random errors in your data collection?
- by ignoring inconsistent data
- by relying on a single measurement
- by taking multiple measurements and averaging them ✓
- by using different equipment each time
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Worksheet
Presentation
Video
Lesson Details
Key learning points
- Process data and plot a graph of appropriate results to identify and describe patterns or trends in the results.
- Explaining the results using ideas about the requirement of light for photosynthesis.
- Identifying sources of systematic and random error that could affect the accuracy of the measurements.
- Suggesting improvements (e.g. ways to measure the amount of gas more accurately).
- Evaluating the precision, repeatability and reproducibility of the results.
Common misconception
Pupils often struggle with the difference between repeatability and reproducibility.
The lesson outlines the difference between these two aspects of working scientifically and checks pupils understanding of these in relation to the investigation.
Keywords
Accuracy - a measurement result is considered accurate if it is judged to be close to the true value
Error - an error leads to measurements being different to what they would otherwise be (the true value)
Precision - the spread of results around the mean value
Repeatability - measurements are similar when repeated by the same person or group using the same equipment and method
Reproducibility - similar results are obtained when an investigation is repeated by another person or group using different equipment