Factors affecting the rate of photosynthesis in plants
In an experiment carried out on a tropical tree, carborn (IV) oxide was measured around the plant at different times of the day. The results obtained were recorded as shown in the table below:
| Time of the day | Percentage of carbon (IV) oxide concentration (x 10-2) |
| 3 am | 3.40 |
| 5 am | 3.60 |
| 7 am | 3.90 |
| 9 am | 3.20 |
| 11 am | 2.95 |
| 1 pm | 2.90 |
| 3 pm | 2.90 |
| 5 pm | 2.92 |
| 7 pm | 3.02 |
| 9 pm | 3.10 |
| 11 pm | 3.20 |
| 1 am | 3.30 |
| 3 am | 3.40 |
- On the grid provided, plot a graph of carbon (IV) oxide concentration against time of the day. (6 marks)
- Calculate the rate of change in carbon (IV) oxide concentration between 4 am and 7 am. (3 marks)
- Explain the in carbon (IV) oxide concentration between the following times of the day. (i) 7 am to 11 am (ii) 12 noon - 3 pm (6 marks)
- The experiment was repeated on a different day and the results obtained were different. (i) Name two environmental factors that may have affected the results. ______________________________________________________________________________________________________________________________________________________________________________________ (ii) Explain how the above factors may have affected the results obtained. _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ (5 marks)
Suggested resposponses
Learner to draw the graph
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