3. •Transpiration is a process in which the water
loss through the plant via its stomata and
lenticels into its external environment.
•Among the factors that affects transpiration
process are light, temperature, humidity, wind
and soil water.
•Plants transpire more rapidly in the light than
in the dark. This is largely because light
stimulates the opening of the stomata .Light
also speeds up transpiration by warming the
leaf.
4. ENGAGE
The plants are sealed in a beaker and left under the
hot sun. After several hours, what can you observed
at the inner surface of the beaker? And HOW those
it happened?
AfterBefore
11. EMPOWER
Discussions
1. What can you observed from the both beakers after
1 hours?
2.From the graph, which condition shows the lowest
rate of transpiration ?
3.From the graph, which condition shows the highest
rate of transpiration ?
4.How the presence of light affect transpiration
process?
5.What are relationship between transpiration rate
and humidity? Explain how it happened
12. Answer
1. Beaker that places at bright place have water droplets
on the surface of the beaker compare to surface of
the beaker at dark place.
2.Plant in the beaker at dark place show the lowest
rate of transpiration.
3. Plant in the beaker at bright place show the highest
rate of transpiration.
4.When the light present, the transpiration rate
increase.
5.If the transpiration rate increase, humidity also
increase. This is due to the water loss in plant. Water
changed into water vapor and this condition will
increase the humidity of surrounding air.
13. ENHANCE
• The man was having a heavy sweating after he do a
run during the hot day.
Is there any similarities between transpiration and
sweating process? If yes, what is the comparison
between both of the process?
14. UNIQUE FEATURES
By using data logger, students can get more accurate
results and this can prevent parallax error during
taking the reading.
Time for the students to carry out this experiment
can be save because same sensors can be run at the
same time.
From the graph, the students can see the changes
occur during the experiments was conducted.
Students can learn how to handle the data logger and
also explore new technology that can be used during
learning and teaching process.
