A student investigated the effect of light intensity on the photosynthesis of pondweed - Edexcel - GCSE Biology Combined Science - Question 3 - 2023 - Paper 2
Question 3
A student investigated the effect of light intensity on the photosynthesis of pondweed.
A light source was placed at different distances from the pondweed.
The bub... show full transcript
Worked Solution & Example Answer:A student investigated the effect of light intensity on the photosynthesis of pondweed - Edexcel - GCSE Biology Combined Science - Question 3 - 2023 - Paper 2
Step 1
State why the student included a water bath in the apparatus.
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Answer
The student included a water bath to maintain a constant temperature, which is important for ensuring that the rate of photosynthesis is not affected by temperature fluctuations.
Step 2
State two variables that should be controlled when completing this investigation.
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Answer
Extraneous light: To ensure that the light intensity measured is only due to the specified light source.
Temperature: To avoid its effects on the rate of photosynthesis.
