Draw a labelled diagram of the apparatus you used to investigate the effect of light intensity or carbon dioxide concentration on the rate of photosynthesis - Leaving Cert Biology - Question c - 2010
Question c
Draw a labelled diagram of the apparatus you used to investigate the effect of light intensity or carbon dioxide concentration on the rate of photosynthesis.
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Worked Solution & Example Answer:Draw a labelled diagram of the apparatus you used to investigate the effect of light intensity or carbon dioxide concentration on the rate of photosynthesis - Leaving Cert Biology - Question c - 2010
Step 1
Draw a labelled diagram of the apparatus you used to investigate the effect of light intensity or carbon dioxide concentration on the rate of photosynthesis.
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Answer
The diagram should include a test tube containing water and an aquatic plant (e.g., Elodea) placed under a light source. The light source can be a lamp positioned at different distances from the plant to manipulate light intensity. Include arrows to indicate light direction, and label the test tube, water, plant, and light source clearly.
Step 2
How did you vary the light intensity or the carbon dioxide concentration?
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Answer
To vary the light intensity, position the lamp at different distances from the plant. For carbon dioxide concentration, use different concentrations of sodium bicarbonate (NaHCO₃) solution in the test tube.
Step 3
How did you measure the rate of photosynthesis?
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Measure the rate of photosynthesis by counting the number of oxygen bubbles produced by the plant over a set period of time.
Step 4
What is the relationship between the rate of photosynthesis and either the light intensity or the carbon dioxide concentration?
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Answer
As either light intensity or carbon dioxide concentration increases, the rate of photosynthesis also increases.
Step 5
State two ways a commercial producer could increase her/his crop yield of tomatoes.
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Answer
Use of extra carbon dioxide in the growing environment.
Applying growth promoters or fertilizers to enhance plant growth.
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