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
(a) (i) State why the student included a water bath in the apparatus.
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Answer
The student included a water bath in the apparatus to maintain a constant temperature during the experiment. This is important because variations in temperature can affect the rate of photosynthesis and lead to inconsistent results.
Step 2
(a) (ii) State two variables that should be controlled when completing this investigation.
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Answer
Extraneous light - to ensure that variations in light intensity do not affect the photosynthesis results.
Temperature - to keep the conditions consistent throughout the experiment.
