Year 11 - Science
The effect of light intensity on rate of photosynthesis in algae: plan
Photosynthesis: factors affecting the rate
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
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.
Lesson Summary
You will learn to plan an investigation into the effect of light intensity on the rate of photosynthesis in algae.
Key Notes
- Algae are living organisms that photosynthesise in the light, carbon dioxide is a reactant.
- Planning an investigation into the effect of light intensity on the rate of photosynthesis in algae.
- Identifying the independent variable (light intensity) and planning how to vary it.
- Identifying factors that should be controlled and how they could be (e.g. temperature).
- Planning a method to measure the dependent variable (colour change of indicator).
Vocabulary To Learn
- rate: a measure of how much change occurs per unit of time
- light intensity: the amount of light reaching a given surface area in a period of time
- hypothesis: an idea, for example an idea about an outcome of an experiment, based on observations and understanding
- variable: a factor that can be changed during an experiment
- control variable: a factor that is kept the same during an experiment
Common Mistakes To Avoid
- Some pupils do not consider how to control variables carefully enough. This means results are likely to be less accurate and so do not provide conclusions that can be used to support a hypothesis.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Algae are living organisms that photosynthesise in the light, carbon dioxide is a reactant. Planning an investigation into the effect of light intensity on the rate of photosynthesis in algae.
2. Define this scientific word and use it in context. 'rate'
a measure of how much change occurs per unit of time. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Some pupils do not consider how to control variables carefully enough. This means results are likely to be less accurate and so do not provide conclusions that can be used to support a hypothesis. Correction: Each type of variable is considered during the lesson and repeated to help pupils to understand the differences between each type of variable.
More Lessons In This Unit
- Climate change and photosynthesis Study Guide
- Factors affecting the rate of photosynthesis Study Guide
- Light intensity and the inverse square law Study Guide
- Photosynthesis and limiting factors Study Guide
- The effect of light intensity on rate of photosynthesis in algae: evaluation Study Guide
- The effect of light intensity on rate of photosynthesis in algae: practical Study Guide
- The effect of light intensity on rate of photosynthesis in pondweed: evaluation Study Guide
- The effect of light intensity on rate of photosynthesis in pondweed: plan Study Guide
- The effect of light intensity on rate of photosynthesis in pondweed: practical Study Guide
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