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Short Breath Cold Sweat
•Transpiration is a process in which the water loss through the plant via its stomata and lenticels into its external environment.•Among the factors that affects transpiration process are light, temperature, humidity, wind and soil water.•Plants transpire more rapidly in the light than in the dark. This is largely because light stimulates the opening of the stomata .Light also speeds up transpiration by warming the leaf.
ENGAGE The plants are sealed in a beaker and left
under the hot sun. After several hours, what can you observed at the inner surface of the beaker? And HOW those it happened?
After Before
Data loggerData logger
Humidity sensor
Humidity sensor
EMPOWER
EMPOWERTime(mm:ss)
Humidity of plant in bright place I/O-1(%)
Humidity of plant in dark place I/O-2(%)
3:35 27.302 28.095
4:35 27.143 28.095
5:35 27.302 28.254
6:35 27.143 28.254
7:35 27.302 28.254
8:35 27.302 28.413
9:35 27.302 28.571
10:35 27.143 28.413
11:35 27.302 28.413
12:35 27.302 28.571
13:35 27.302 28.571
Time(mm:ss)Humidity of plant in bright place
I/O-1(%)Humidity of plant in dark place
I/O-2(%)
14:35 27.302 28.413
15:35 27.302 28.571
16:35 27.143 28.413
17:35 26.984 28.571
18:35 27.143 28.73
19:35 26.984 28.73
20:35 26.825 28.73
21:35 27.46 28.73
22:35 26.349 28.73
23:35 26.032 28.73
24:35:00 26.825 28.571
25:35:00 26.667 28.73
26:35:00 26.349 28.73
27:35:00 26.349 28.73
28:35:00 26.825 28.571
29:35:00 26.825 28.73
30:35:00 26.19 28.73
Time(mm:ss)Humidity of plant in bright place
I/O-1(%)Humidity of plant in dark place
I/O-2(%)
31:35:00 26.984 28.73
32:35:00 27.302 28.73
33:35:00 25.873 28.73
34:35:00 25.714 28.73
35:35:00 24.921 28.73
36:35:00 26.032 28.73
37:35:00 26.19 28.73
38:35:00 25.873 28.73
39:35:00 26.349 28.73
40:35:00 25.238 28.889
41:35:00 25.556 28.73
42:35:00 25.714 28.73
43:35:00 26.508 28.889
44:35:00 27.302 28.73
45:35:00 26.984 28.73
46:35:00 26.349 28.73
47:35:00 26.825 28.73
48:35:00 26.032 28.889
Time(mm:ss)Humidity of plant in bright place
I/O-1(%)Humidity of plant in dark place I/O-
2(%)
49:35:00 25.873 28.73
50:35:00 24.921 28.889
51:35:00 25.714 28.889
52:35:00 26.508 28.889
53:35:00 25.397 28.889
54:35:00 26.984 28.889
55:35:00 25.714 28.889
56:35:00 24.762 28.889
57:35:00 25.397 28.889
58:35:00 25.397 28.889
59:35:00 25.873 29.048
0:35 26.19 29.048
Humidity of plant in bright place
Humidity of plant in bright place
EMPOWERDiscussions1.What can you observed from the both
beakers after 1 hours?2.From the graph, which condition shows the
lowest rate of transpiration ?3.From the graph, which condition shows the
highest rate of transpiration ?4.How the presence of light affect
transpiration process?5.What are relationship between transpiration
rate and humidity? Explain how it happened
Answer1.Beaker that places at bright place have water
droplets on the surface of the beaker compare to surface of the beaker at dark place.
2.Plant in the beaker at dark place show the lowest rate of transpiration.
3.Plant in the beaker at bright place show the highest rate of transpiration.
4.When the light present, the transpiration rate increase.
5.If the transpiration rate increase, humidity also increase. This is due to the water loss in plant. Water changed into water vapor and this condition will increase the humidity of surrounding air.
ENHANCE• The man was having a heavy sweating after
he do a run during the hot day. Is there any similarities between
transpiration and sweating process? If yes, what is the comparison between both of the process?
UNIQUE FEATURES By using data logger, students can get more
accurate results and this can prevent parallax error during taking the reading.
Time for the students to carry out this experiment can be save because same sensors can be run at the same time.
From the graph, the students can see the changes occur during the experiments was conducted.
Students can learn how to handle the data logger and also explore new technology that can be used during learning and teaching process.
