Two identical leafy shoots E and F from a shrub, were each connected to a potometer. One was placed under normal laboratory conditions and the other under a fan in the laboratory. The distance moved by each bubble in each potometer was recorded at regular time intervals.
The results obtained are shown in the table below.
Study the information in the table carefully and use them to answer question 2(a) to 2(f).
Time after start of experiment
(mins) |
Distance moved by each bubble (mm) |
Shoot E (normal) laboratory condition) |
Shoot F (in the laboratory under the fan) |
0 |
0 |
0 |
5 |
3 |
5 |
10 |
5 |
10 |
15 |
8 |
18 |
20 |
11 |
28 |
25 |
13 |
33 |
- Plot two graphs, one for each shoot on the graph sheet provided, with the distance
moved by the bubble on the vertical axis (y) and the time on the horizontal axis (x).
- (i) Under which condition did the bubble move faster?
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[ 1 mark ]
(ii) Explain the effect of the fan on the shoot.
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[ 3 marks ]
- What is the aim of the experiment?
Aim of experiment:
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[2 marks ]
- (i) Name the physiological process experienced by the leafy shoots
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[ 1 mark ]
- Name one structure of the leaf associated with the process named in 2(c)(i) above.
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[1 mark ]