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An investigation was carried out to determine the wavelength of light at which the rate of photosynthesis in algal cells was greatest - Scottish Highers Biology - Question 10
Question 10
An investigation was carried out to determine the wavelength of light at which the rate of photosynthesis in algal cells was greatest. Algal cells were immobilised ... show full transcript
Worked Solution & Example Answer:An investigation was carried out to determine the wavelength of light at which the rate of photosynthesis in algal cells was greatest - Scottish Highers Biology - Question 10
Step 1
Identify one variable, not already mentioned, which would have to be controlled so that a valid conclusion could be drawn.
Answer
One variable that must be controlled is the light intensity. Ensuring a consistent distance between the light source and the tubes can help maintain uniform light exposure across all samples.
Step 2
Suggest how the investigation could be improved to ensure that the algal cells are only exposed to light from the lamp.
Answer
The investigation could be improved by conducting it in a dark room where no other light sources are present, or by covering the tubes with opaque materials except for the area directly exposed to the lamp.
Step 3
Step 4
Describe how the experimental procedure could be improved to increase the reliability of the results.
Answer
To increase reliability, the experiment should be repeated multiple times at each wavelength, with average readings taken to account for any anomalies. Additionally, using the same gel bead concentration throughout all tests would help standardize the conditions.
Step 5
Suggest how the species of algae living under floating surface plants are still able to photosynthesise.
Answer
These algae may possess carotenoids, which enable them to absorb light in wavelengths that are transmitted by the floating plants. Additionally, they might adapt to lower light conditions by optimizing their photosynthetic mechanisms.