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An experiment was carried out at a constant temperature and with a constant carbon dioxide concentration in order to determine the effect of changing light intensity on the photosynthetic rate - VCE - SSCE Biology - Question 15 - 2019 - Paper 1
Question 15
An experiment was carried out at a constant temperature and with a constant carbon dioxide concentration in order to determine the effect of changing light intensity... show full transcript
Worked Solution & Example Answer:An experiment was carried out at a constant temperature and with a constant carbon dioxide concentration in order to determine the effect of changing light intensity on the photosynthetic rate - VCE - SSCE Biology - Question 15 - 2019 - Paper 1
Step 1
Step 2
Step 3
Light intensity is a limiting factor when the photosynthetic rate is less than 40 arbitrary units.
Answer
The data suggests that as light intensity increases, the photosynthetic rate rises until it approaches a maximum. Thus, light intensity acts as a limiting factor below the threshold where the photosynthetic rate exceeds 40 arbitrary units.
Step 4
Increasing the amount of carbon dioxide at a light intensity of 16 arbitrary units would lead to a decrease in the photosynthetic rate.
Answer
At a light intensity of 16 arbitrary units, the graph indicates that the photosynthetic rate is stable and at its maximum. Increasing carbon dioxide in this scenario would typically not cause a decrease in the photosynthetic rate; hence, this statement is incorrect.