1. The document describes an experiment to determine which condition - presence or absence of light - causes a plant to lose more water through transpiration. 2. Students used a data logger and humidity sensor to record humidity levels over 16 hours with a plant in light and in darkness. 3. The results showed that the plant lost more water and the humidity in the bag decreased more when the plant was in the light compared to in darkness.

1. DATA LOGGING
INFORMATION AND COMMUNICATION TECHNOLOGY IN
SCIENCE (SSI 3013)
Members Matric Number
Umi Nabilah Binti Ismail D20101037464
Nabilah Binti Komaruddin D20101037466
Nazratul Ilyana Binti Mohamad D20101037470

2. RATE OF TRANSPIRATION

3. SCIENTIFIC CONCEPT
 Transpiration is a process loss of water in the form
of water vapor from part of plant especially leaves
but also in stems, flower and roots.
 Leaves transpiration occur through stomata.
 Transpiration cools plants and enable mass flow of
mineral nutrients and water from roots to shoots.

4. PROBLEM STATEMENT
 To study which condition either present or absent of
light will causes the plant loses water most.

5. OBJECTIVE
 To determine which condition causes the plant
loses water most.
 To understand the transpiration phenomenon.
 To examine the phenomenon by using data logger.

6. ENGAGE
Which plant will lose water most?
Why des it happened?

7. EMPOWER
Planning and doing your experiment:

8. PROCEDURE:
 Done the experiment in the laboratory (presence of
light).
 Set up the apparatus as the diagram above.
 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).

9. RESULT:

10.  Table of Humidity inside the Laboratory

12.  Graph of Humidity inside the Laboratory

13.  Table of Humidity inside the Cupboard

15.  Graph of Humidity inside the Cupboard

16. DISCUSSION:
 Question:
1. What cause the plastic bag to turn cloudy at the
end of the experiment?
2. What triggers the water to be expelled from the
plant?
3. Where does the water which has been expelled
come from?
4. Which structure in the leaf helps to draw water
out?
5. Which structure helps to control the opening and
closing of stomata?

17.  Answer:
1. There were water droplets in the bag. The bag may
appear cloudy because of water vapor in the bag.
2. The inner side of the plant is in hot condition. Thus, to
make it cooler the plant has to expel the water out from
its body.
3. The water comes from the soil. The uptake of water
from the soil is via osmosis, and then the water enters
neighboring cells until it reached the pore.

18. 4. The structure which responsible in drawing the water
out is stomata. Stomata are a special type of pore
opening on leaves of plants. They are designed to
absorb water from sources such as rain while also
removing excess water in the plant through
transpiration.
5. The regulation of opening and closing of stomata is
controlled by guard cell. It is one of the paired cells in
the epidermis of a plant that control the opening and
closing of a stoma of a leaf. When swollen with water,
guard cells pull apart from each other, opening the
stoma to allow the escape of water vapor and the
exchange of gases. When drier, guard cells become
more flaccid and move closer together, allowing the
plant to conserve water.

19. ENHANCE
 Sweating is uncomfortable and makes us sticky, but it
cooler 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?

20. 1. 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 us
when it is hot feels good. Being wet during cold weather,
however can excessively chill us because of this same
evaporation effect. 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.

21. 2. Sweating in plant
Transpiration happens when plants give off water vapor
through tiny pores in their leaves. This is the plant way
of getting rid of waste, just like people and animals
sweat when they are hot. This water vapor evaporates
into the air and is stored in the atmosphere until it
becomes clouds or precipitation.

22. EXTENSION
Experiment can be
repeated or stopped at
any time as most of the
work is taken over by the
data logger
It can save our time The pattern of
since the Unique temperature and
experiments do not humidity changes can
Features
take a long period. be observed on the
same graph
More than one sensor can
be used simultaneously
(humidity and temperatures
sensor)