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 =)