Data logger presentation

NOOR ZANARRIYAH MOHAMAD GANI D20091034842SITI SHAHIDA MOHD AZIRID20091034836SARAH SABILLAH IBRAHIMD20091034820ZAINAB FASIHAH MUHAMAD SUKARDID20091034842

I need to cool down!

ENGAGEI Need To Cool Down

Study this picture, where does the water in the pot go? Explain.

EMPOWERPlanning 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

EMPOWERPlanning and Doing Your Experiment

Part 1 : Relative Humidity and Temperature

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 26.66743:51:00 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

59:51:00 22.231 26.825

EMPOWERResults

Relative Humidity and Temperature

Time(mm:ss)26:51 16:49 06:47 56:45 46:43 36:41 26:39

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EMPOWERResults

Relative Humidity and Temperature

EMPOWERDisccussion

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? 

EMPOWERAnswers 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

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.

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.

ENHANCE

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