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.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The student included a water bath to maintain a constant temperature during the experiment. This ensures that temperature variations do not affect the rate of photosynthesis, allowing for reliable results.
Step 2
State two variables that should be controlled when completing this investigation.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Extraneous light should be controlled by using the same light source throughout the experiment.
The temperature of the pond water should be kept constant to avoid influencing the rate of photosynthesis.
