The document contains data from an experiment measuring relative humidity and temperature over a period of 50 minutes. It records temperature and humidity readings taken at 1-minute intervals. It also includes graphs plotting the temperature and humidity measurements over time. The document discusses the results and asks questions about transpiration and the factors that influence it.

1. NOOR ZANARRIYAH MOHAMAD GANI D20091034842
SITI SHAHIDA MOHD AZIRI D20091034836
SARAH SABILLAH IBRAHIM D20091034820
ZAINAB FASIHAH MUHAMAD SUKARDI D20091034842

2. I need to cool down!

3. ENGAGE
I Need To Cool Down
Study this picture, where does the water in the
pot go? Explain.

4. EMPOWER
Planning and Doing Your Experiment
Part 1 : Relative Humidity and Temperature
Data loggerData logger
Plastic bagPlastic bag
Humidity sensorHumidity sensor Temperature sensorTemperature sensor
Retort standRetort stand
ComputerComputer

5. EMPOWER
Planning and Doing Your Experiment
Part 1 : Relative Humidity and Temperature

6. Time(mm:ss) Temperature I/O-1(°C) Humidity I/O-2(%)
26:51:00 22.536 26.984
27:51:00 22.536 27.143
28:51:00 22.739 27.302
29:51:00 22.739 27.302
30:51:00 22.941 27.302
31:51:00 22.941 27.302
32:51:00 22.941 27.143
33:51:00 22.941 27.46
34:51:00 23.043 27.143
35:51:00 22.941 27.302
36:51:00 23.043 27.302
37:51:00 22.941 27.143
38:51:00 22.941 27.302
39:51:00 22.84 27.143
40:51:00 22.84 27.143
41:51:00 22.637 26.984
42:51:00 22.536 26.667
43:51:00 22.333 26.825
44:51:00 22.333 26.984
45:51:00 22.434 27.143
46:51:00 22.434 26.984
47:51:00 22.434 27.143
48:51:00 22.637 27.143
49:51:00 22.637 27.143
50:51:00 22.434 26.984
51:51:00 22.536 26.984
52:51:00 22.536 27.143
53:51:00 22.536 27.143
54:51:00 22.434 26.984
55:51:00 22.434 27.143
56:51:00 22.434 26.984
57:51:00 22.333 27.143
58:51:00 22.434 26.984
EMPOWER
Results
Relative Humidity and Temperature

7. 26:51 16:49 06:47 56:45 46:43 36:41 26:39
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0
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EMPOWER
Results
Relative Humidity and Temperature

8. EMPOWER
Disccussion
Relative Humidity and Temperature
1. What cause the plastic bag to turn cloudy at the end of the experiment?
2. What triggers the water to be expelled from the plant?
3. Where does the water which has been expelled come from?
4. Which structure in the leaf helps to draw water out?
5. Which structure helps to control the opening and closing of stomata?
6. How does transpiration takes place?
7. What is the difference between transpiration that takes place during the
day and night ?
8. In your opinion, if the plant is in wilt condition, does transpiration still
take place? Why?
9. Does the water content in plant influence transpiration rate?
10. What are other factors which may influence transpiration to occur?

9. EMPOWER
Answers to Discussion
Relative Humidity and Temperature
1. There were water droplets in the bag. The bag may appear cloudy
because of water vapor in the bag.
2. The inner side of the plant is in hot condition. Thus, to make it
cooler the plant has to expelled the water out from its body.
3. The water comes from the soil. The uptake of water from the soil is
via osmosis, then the water enters neighbouring cells until it
reached the pore.
4. The structure which responsible in drawing the water out is
stomata. Stomata are a special type of pore opening on leaves of
plants. They are designed to absorb water from sources such as
rain while also removing excess water in the plant through
transpiration

10. 5. The regulation of opening and closing of stomata is controlled by guard
cell. It is one of the paired cells in the epidermis of a plant that control the
opening and closing of a stoma of a leaf. When swollen with water,
guard cells pull apart from each other, opening the stoma to allow the
escape of water vapour and the exchange of gases. When drier, guard
cells become more flaccid and move closer together, allowing the plant
to conserve water.
6. When the plant has too much water, the guard cells open and permit the
stomata to release water into the air. This water is replaced by the
movement of water from neighbouring cells. Eventually water is pulled
up the plant through cells in the trunk or stem by capillary action.
7. On a sunny day the guard cells are open and water vapour escapes
through the stomata. At night the guard cells are partially or completely
closed and little water escapes.

11. 8. No. This is because there is no supply of water from
the soil and stomata are closed. Furthermore the
wilt plant needs to conserve water until the plant
become turgid again.
9. Yes. The water content does influence the
transpiration rate. The greater the water content in
the plant body, the higher will be the transpiration
rate.
10. Transpiration is actually being influenced by
environmental factors. There are 5 factors
altogether which are light, wind, relative humidity,
temperature and soil water.

12. ENHANCE
Have you ever seen this phenomenon before.
Why does this man is sweating a lot? Explain