A student investigated the effect of light intensity on the photosynthesis of pondweed - Edexcel - GCSE Biology - Question 5 - 2023 - Paper 2
Question 5
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 bubbl... show full transcript
Worked Solution & Example Answer:A student investigated the effect of light intensity on the photosynthesis of pondweed - Edexcel - GCSE Biology - Question 5 - 2023 - Paper 2
Step 1
State why the student included a water bath in the apparatus.
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Answer
The water bath helps to maintain a constant temperature during the experiment. This is crucial because temperature can affect the rate of photosynthesis, and controlling it ensures that changes in bubble production are due to light intensity alone.
Step 2
State two variables that should be controlled when completing this investigation.
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Answer
The temperature of the water, as it can influence the rate of photosynthesis.
The type and age of the pondweed used, to ensure consistent biological material across trials.
