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COOL IS MY BUDDY!
TRANSPIRATION
SCIENTIFIC CONCEPT 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.
ENGAGE
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?
EMPOWERSet 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.
SET UP EXPERIMENT:
RESULT
Time(mm:ss) Humidity I/O-1(%) Humidity I/O-2(%)
29:32:00 23.81 20.31730:32:00 24.286 20.31731:32:00 24.921 20.31732:32:00 25.397 20.31733:32:00 25.556 20.31734:32:00 25.873 20.15935:32:00 26.032 20.15936:32:00 26.19 2037:32:00 26.349 2038:32:00 26.508 19.84139:32:00 26.508 19.84140:32:00 26.825 19.84141:32:00 27.143 19.68342:32:00 26.984 19.68343:32:00 26.984 19.68344:32:00 26.984 19.68345:32:00 27.143 19.52446:32:00 26.984 19.52447:32:00 27.143 19.36548:32:00 27.143 19.20649:32:00 27.302 19.36550:32:00 27.46 19.36551:32:00 27.302 19.20652:32:00 27.302 19.20653:32:00 27.46 19.20654:32:00 27.46 19.20655:32:00 27.46 19.20656:32:00 27.46 19.20657:32:00 27.619 19.206
Graph from the result :
Time(mm:ss)29:32 34:32 39:32 44:31 49:31 54:31
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DISCUSSION1.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?
ENHANCE
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?
Sweating in humanThe 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 plantTranspiration 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.
UNIQUE FEATURE OF THIS ACTIVITY
>> 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.
