The effect of light intensity on rate of photosynthesis in pondweed: plan
I can plan an investigation into the effect of light intensity on the rate of photosynthesis in pondweed.
The effect of light intensity on rate of photosynthesis in pondweed: plan
I can plan an investigation into the effect of light intensity on the rate of photosynthesis in pondweed.
Lesson details
Key learning points
- Pondweed is a plant that photosynthesises in the light, releasing oxygen gas as a waste product.
- Planning an investigation into the effect of light intensity on the rate of photosynthesis in pondweed.
- Identifying the independent variable (light intensity) and planning how to vary it.
- Identifying factors that should be controlled and how they could be controlled (e.g. temperature).
- Planning methods to measure the dependent variable (number of bubbles and volume of gas given off).
Common misconception
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.
Each type of variable is considered during the lesson and repeated to help pupils to understand the differences between each type of variable.
Keywords
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
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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