1. TRANSPIRATION

2.  Transpiration is the evaporation of water into
the atmosphere from the leaves and stems of
plants. Plants absorb water through their
roots. This water can come from deep in the
soil.

3. Plant BPlant A
Picture above show the plants leaves size.
What are the different from the leaves of two picture
above?
Why does it is difference?

4. Set up of the experiment.
Procedure :
1. Put 2 plants on the table.
2. One branch of both the plant, the humidity
sensor into the polythene bag and the end
tied up with string.
3. The experiment was carry out in 30
minutes.
4. The result will be collected through the
sensor used.

6. RESULT
Time(mm:ss) Humidity I/O-1(%) Humidity I/O-2(%)
29:32:00 23.81 20.317
30:32:00 24.286 20.317
31:32:00 24.921 20.317
32:32:00 25.397 20.317
33:32:00 25.556 20.317
34:32:00 25.873 20.159
35:32:00 26.032 20.159
36:32:00 26.19 20
37:32:00 26.349 20
38:32:00 26.508 19.841
39:32:00 26.508 19.841
40:32:00 26.825 19.841
41:32:00 27.143 19.683
42:32:00 26.984 19.683
43:32:00 26.984 19.683
44:32:00 26.984 19.683
45:32:00 27.143 19.524
46:32:00 26.984 19.524
47:32:00 27.143 19.365
48:32:00 27.143 19.206
49:32:00 27.302 19.365
50:32:00 27.46 19.365
51:32:00 27.302 19.206
52:32:00 27.302 19.206
53:32:00 27.46 19.206
54:32:00 27.46 19.206
55:32:00 27.46 19.206
56:32:00 27.46 19.206
57:32:00 27.619 19.206

7. Graph from the result :

8. 1.What is the name of the small pores found on the
underside of leaves?
2. What can you infer from this graph of plant A and
plant B?
3.Compare the humidity rate between the plant A
and plant B.
4.Why in plant B the humidity rate becomes lower
over time?
4.How can humidity give influence to transpiration
process?
5.What the another factor that influence the rate of
transpiration?
6. What will plant produce if transpiration occur?

9. Sweating is uncomfortable and makes us sticky,
but it cools the body.
If human have a process that can cool down
their body temperature, through sweating, so,
what about plant? Explain how does it occur?

10. Sweating in human
The process of sweat evaporating from the body is responsible for the
cooling effect. By sweating, our body releases moisture onto our skins
and in the process, heat is taken away from our body. When we sweat,
our skin and clothing become covered with water. If the atmospheric
humidity is low, this water evaporates easily. The heat energy needed to
evaporate the water comes from our bodies. So this evaporation cools
our bodies, which have too much heat. For the same reason splashing
water on ourselves when it is hot feels good. Being wet during cold
weather, however can excessively chill us because of this same
evaporation effect. Sweating is therefore the human body's primary
cooling mechanism. Because this mechanism uses water, we need to
replace lost fluids by drinking more fluids in hot weather. This is
especially true after exercising or working in hot weather.
Sweating in plant
Transpiration happens when plants give off water vapour through tiny
pores in their leaves. This is the plant s way of getting rid of waste, just
like people and animals sweat when they are hot. This water vapour
evaporates into the air and is stored in the atmosphere until it becomes
clouds or precipitation.

11. >> Experiment can be
repeated for a
several time because
the work is taken
over by the data
logger.
>> Both humidity
sensor plant A and
plant B in this topic
can be conduct
simultaneously and
save time.
>> It will allow the
pupils to compare
the results with the
other group and pose
a question.
>> The pattern of the
humidity change for
plant A and plant B
can be observe
trough graph along
this experiment.