(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
(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:(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, which are specialized organelles found in plant cells. They contain chlorophyll, the pigment that captures light energy.
Step 2
Which biomolecule is made by photosynthesis?
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Answer
The primary biomolecule produced by photosynthesis is glucose, a simple sugar that serves as an energy source for plants and other organisms.
Step 3
Which of the two factors did you investigate?
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Answer
In my investigation, I chose to explore how the rate of photosynthesis depends on light intensity.
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 show a submerged water plant (like an Elodea) in a water vessel with a lamp directed at it. The labels should include: Water Plant, Water, Lamp, Glass Vessel, Bubbles (produced during photosynthesis).
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 water plant. This alteration allowed me to measure the effect of different levels of light on the rate of photosynthesis.
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 bubbles produced by the plant per minute. Each bubble represents oxygen released, indicating the level of photosynthetic activity.
Step 7
Describe a source of error in this investigation.
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Answer
A potential source of error in this investigation could be inadequate light due to uncooperative pondweed or inconsistent light sources, which may affect the rate of photosynthesis observed.
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