2. SCIENTIFIC CONCEPT
Plant 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.
5. EMPOWER
Plant 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).
18. EMPOWER
Plant Cooler
Discussion
Questions
1.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?
19. ENHANCE
Plant 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.
20. ENHANCE
Plant 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.
21. Unique Feature of This Activity
The 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.
