A measurement result is considered accurate if it is judged to be close to the true value.

An error leads to measurements being different to what they would otherwise be (the true value).

Precision refers to how closely results are spread around the mean value.

Measurements are similar when repeated by the same person or group using the same equipment and method.

Similar results are obtained when an investigation is repeated by another person or group using different equipment.

The effect of light intensity on rate of photosynthesis in algae: evaluation

Combined science

Pupils learned about ways in which the human body maintains a constant internal environment in response to internal and external change, including changes in temperature and water balance.

This unit explores factors affecting photosynthesis rates and focuses on planning and conducting experiments. It includes selecting techniques, accurate measurements, data analysis, and evaluating methods to improve reliability and suggest further investigations.

Photosynthesis: factors affecting the rate

Physical activity and equipment requiring safe use

to identify errors and suggest improvements

What is the purpose of evaluating an experiment?

the spread of results around the mean value

the consistency of results by different groups

the consistency of results by the same group

What does precision in an experiment refer to?

How can you improve the accuracy of pH measurement in photosynthesis experiments?

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

What does reproducibility in an experiment mean?

by comparing results to known standards or controls

by repeating the experiment multiple times

How can systematic errors be identified in an experiment?

by taking multiple measurements and averaging them

How can you reduce random errors in your data collection?

Plants produce glucose and {{}} during photosynthesis.

What is the role of chlorophyll in photosynthesis?

What is the gas taken in by plants for photosynthesis?

In which cell organelle does photosynthesis occur?

How can gas production be measured in photosynthesis experiments?

Content guidance

Risk assessment required - equipment

Adult supervision required

Starter Quiz