The effect of light intensity on rate of photosynthesis in pondweed: practical
I can carry out 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: practical
I can carry out an investigation into the effect of light intensity on the rate of photosynthesis in pondweed.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Following an appropriate method to vary light intensity and measure the gas given off
- Accurate measurement of variables (distance, time, amount of gas) and control of variables that might affect the results
- Counting bubbles and measuring volume of gas given off
- Record results in an appropriate table
Keywords
Light intensity - the amount of light reaching a given surface area in a period of time
Rate - a measure of how much change occurs per unit of time
Variable - a factor that can be changed during an experiment
Control variable - a factor that is kept the same during an experiment
Accurate - a measurement result is considered accurate if it is judged to be close to the true value
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.
Equipment
Light source, stopclock, plasticine, filter funnel, measuring cylinder, large beaker, 1 m rule, pondweed.
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).
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
