(a) (i) Where in a plant cell does photosynthesis take place? ......................... - Leaving Cert Biology - Question 7 - 2013
Question 7
(a) (i) Where in a plant cell does photosynthesis take place? ..........................
(ii) Name the gas released during photosynthesis. .......................... show full transcript
Worked Solution & Example Answer:(a) (i) Where in a plant cell does photosynthesis take place? ......................... - Leaving Cert Biology - Question 7 - 2013
Step 1
(i) Name the plant that you used.
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Answer
The plant used for this investigation was an aquatic plant, specifically Elodea.
Step 2
(ii) How did you vary the light intensity or the carbon dioxide concentration?
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I varied the light intensity by changing the distance of the lamp from the beaker of water containing the plant. The closer the lamp was to the beaker, the greater the light intensity.
Step 3
(iii) Name one factor that you kept constant during the investigation.
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One factor that I kept constant during the investigation was the temperature of the water.
Step 4
(iv) How did you keep that factor constant?
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I ensured the water temperature remained constant by using a water bath at a consistent temperature throughout the experiment.
Step 5
(v) How did you measure the rate of photosynthesis?
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The rate of photosynthesis was measured by counting the number of bubbles produced by the plant per unit time, as these bubbles represent oxygen release.
Step 6
(vi) What was the result of your investigation?
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The investigation showed that greater light intensity or higher carbon dioxide concentration resulted in a higher rate of photosynthesis, as indicated by an increase in the number of oxygen bubbles produced.
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