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The use of data logger in transpiration experiment....
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SCIENTIFIC CONCEPTPlant Cooler
Transpiration is a process loss of water in the form of water vapour from part of plant especially leaves but also in stems, flowers and roots.
Leaves transpiration occur through stomata.Transpiration cools plants and enable mass
flow of mineral nutrients and water from roots to shoots.
ENGAGEPlant Cooler
in dark place in bright place
Which plant will lose water most?
Why does it happened?
EMPOWERPlant Cooler
Planning And Doing Your Experiment
EMPOWERPlant Cooler
Planning And Doing Your Experiment
Procedure: Done the experiment in the laboratory (presence of
light). Set up the apparatus as the diagram before. Place the humidity sensor inside the plastic bag and
wrapped around a branch of the plant. Set the data logger. Start the data logger and record the result for 16
hours. Repeat the experiment by place the plant at the
different place that are inside the cupboard (absence of light).
EMPOWERPlant Cooler
RESULT
TABLE OF HUMIDITY
INSIDE THELABORATORY
EMPOWERPlant Cooler
RESULT
Time (s) Humidity I/O-1%
0 0 23.968
1 1 23.81
2 2 23.968
3 3 24.127
4 4 24.289
5 5 24.444
6 6 24.444
7 7 24.444
8 8 24.603
9 9 24.603
10 10 24.762
Time (s) Humidity I/O-1%
19 19 24.921
20 20 25.238
21 21 25.238
22 22 25.238
23 23 25.238
24 24 25.238
25 25 25.079
26 26 25.397
27 27 25.397
28 28 25.397
29 29 25.556
EMPOWERPlant Cooler
RESULTTime (s) Humidity I/O-1%
257 257 25.873
258 258 26.032
259 259 25.873
260 260 26.032
261 261 26.032
262 262 26.19
263 263 26.032
264 264 26.032
265 265 26.032
266 266 26.873
267 267 26.873
Time (s) Humidity I/O-1%
406 406 26.984
407 407 27.143
408 408 27.143
409 409 27.143
410 410 27.143
411 411 26.984
412 412 27.143
413 413 26.984
414 414 27.143
415 415 27.143
416 416 27.143
EMPOWERPlant Cooler
RESULT
Time (s) Humidity I/O-1%
619 619 27.937
620 620 28.095
621 621 28.095
622 622 28.095
623 623 28.095
624 624 28.095
625 625 28.095
626 626 28.254
627 627 28.095
628 628 28.095
629 629 28.254
EMPOWERPlant Cooler
RESULT
GRAPH OF HUMIDITY
INSIDE THE LABORATORY
Time(mm:ss)36:13 16:09 56:05 36:01 15:58 55:54 35:50 15:46 55:42 35:38
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
EMPOWERPlant Cooler
RESULT
TABLE OF HUMIDITY
INSIDE THE CUPBOARD
EMPOWERPlant Cooler
RESULT
Time (s) Humidity I/O-1%
0 0 23.175
1 1 24.127
2 2 25.079
3 3 25.556
4 4 26.032
5 5 26.349
6 6 26.667
7 7 26.825
8 8 26.984
9 9 26.984
10 10 27.302
Time (s) Humidity I/O-1%
11 11 27.46
12 12 27.619
13 13 27.619
14 14 27.619
15 15 27.778
16 16 27.937
17 17 28.095
18 18 28.254
19 19 28.095
20 20 28.254
21 21 28.413
EMPOWERPlant Cooler
RESULTTime (s) Humidity I/O-1%
22 22 28.413
23 23 28.413
24 24 28.413
25 25 28.571
26 26 28.571
27 27 28.571
28 28 28.571
29 29 28.73
30 30 28.73
31 31 28.73
32 32 28.571
Time (s) Humidity I/O-1%
56 56 28.889
57 57 29.048
58 58 29.048
59 59 28.889
60 60 29.206
61 61 29.048
62 62 29.048
63 63 29.048
64 64 29.048
65 65 29.048
66 66 29.048
EMPOWERPlant Cooler
RESULT
GRAPH OFHUMIDITY
INSIDE THE CUPBOARD
Time(mm:ss)02:06 42:02 21:58 01:55 41:51 21:47 01:43 41:39 21:35 01:31
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
EMPOWERPlant Cooler
RESULT
Water droplet
EMPOWERPlant CoolerDiscussion
Questions1.Compare the two graph and describe the differences
between them.
2.Was there any visible sign of water loss in the experiment? Describe what you have seen.
3.Does the presence of light have any effect on how humidity rises?
4.What are the different in humidity rise when there was a presence of light or not?
5.Why transpiration important to plants?
ENHANCEPlant Cooler
Early in the morning, you can find water
droplets at the tip of the leaves.
Why does this has happen??? Discuss with your friends.
ENHANCEPlant Cooler
Answer :-
At night, water vapor cannot move out from the stomata because most plants have their stomata closed. When there is high soil
moisture level, water will enter the plant root. The water will accumulate in the plant, creating a slight root pressure. The root
pressure forces some water to exude through special leaf tip or edge structure and forming
drops that are water droplet.
Unique Feature of This ActivityThe apparatus that we use was only the humidity sensor, plant and plastic bag. So, less time taken to set up the apparatus.
We can stopped the data logger whenever we want because before start the experiment, we had set the time and when the time for the experiment had finished it will stopped automatically.
The changes in humidity cannot be detected by our naked eyes. So, by using the data logger the reading of humidity can be record every one minutes per hour.
THANK YOU =)