7. (a) (i) In which plant cell structure does photosynthesis take place?
(ii) Which biomolecule is made by photosynthesis?
(b) Answer the following questions about an investigation that you carried out to see how the rate of photosynthesis depends on light intensity or on carbon dioxide (CO₂) concentration - Leaving Cert Biology - Question 7 - 2019
Question 7
7. (a) (i) In which plant cell structure does photosynthesis take place?
(ii) Which biomolecule is made by photosynthesis?
(b) Answer the following questions about... show full transcript
Worked Solution & Example Answer:7. (a) (i) In which plant cell structure does photosynthesis take place?
(ii) Which biomolecule is made by photosynthesis?
(b) Answer the following questions about an investigation that you carried out to see how the rate of photosynthesis depends on light intensity or on carbon dioxide (CO₂) concentration - Leaving Cert Biology - Question 7 - 2019
Step 1
In which plant cell structure does photosynthesis take place?
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Answer
Photosynthesis occurs in the chloroplasts of plant cells, which contain chlorophyll that captures light energy.
Step 2
Which biomolecule is made by photosynthesis?
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Answer
The main biomolecule produced by photosynthesis is glucose, which serves as an energy source for the plant.
Step 3
Which of the two factors did you investigate?
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Answer
I investigated the effect of light intensity on the rate of photosynthesis.
Step 4
In the space below draw and label a diagram of the apparatus you used in your investigation.
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Answer
The diagram should depict a submerged aquatic plant in a beaker of water, with a lamp positioned at a specific distance from it. Labels should include 'water plant', 'lamp', 'water', and any bubbles produced by the plant.
Step 5
How did you vary your chosen factor?
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Answer
I varied the light intensity by moving the lamp closer to or further away from the plant, ensuring that the distance was measured accurately.
Step 6
How did you measure the rate of photosynthesis?
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Answer
The rate of photosynthesis was measured by counting the number of oxygen bubbles produced by the submerged plant per minute.
Step 7
Describe a source of error in this investigation.
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Answer
A possible source of error could be inadequate light exposure, which might lead to uncooperative pondweed not releasing bubbles consistently, affecting the results.
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