Science 7 - LAND and SEA BREEZE and its Characteristics
DATA LOGGER
1. DATA LOGGER
Najat BintiMd Muhtar (D20152071966)
Noor Nadia BintiAlias (D20152071973)
Nor Erlina Binti MohdSahi (D20152071991
SBI 3013
INFORMATION AND COMMUNICATION
TECHNOLOGY IN BIOLOGY
2. What is data logger?
Data logger is an instrument that capable of
picking up and storing signals from sensors.
Data logging is the measurement and recording of
physical or electrical parameters over a period of
time.
Common measurement: temperature, pressure,
transpiration, current, velocity, etc.
3.
4. 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.
5. Problem statement
To study which condition either present or absent of
light will cause the plant loses water most?
6. Objectives
To determine which condition cause the plant lose
water most.
To understand the transpiration phenomenon.
To examine the phenomenon by using data logger.
7. ENGAGE
I Need To Cool Down
During a hot and sunny day, it seems that, sitting under a tree is
much cooler compared to the surrounding that is exposed to
sunlight. Why
this phenomenon occur? Explain.
9. Procedure
Done the experiment in the laboratory (presence of
light)
Set up the apparatus as diagram above.
Place the humidity sensor inside the plastic bag
and wrapped around a branch of plant.
Set the data logger.
Set the data logger and record the result for a few
hours.
Repeat the experiment by place the plant at
different place that are inside the cupboard
(absence of light).
14. PBL 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?
15. PBL Answer
There were water droplets in the bag. The bag may
appear cloudy because of water vapour in the bag.
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.
The water comes from the soil. The uptake of water
from the soil is via osmosis, then the water enters
neighbouring cell until it reached the pore.
16. Enhance
Why it is not advisable to
water the plant during
mid-day?
Explain the
phenomenon.
17. UNIQUE FEATURES
Unique
Features
Experiment can be
repeated or stopped at
any time as most of the
work is taken over by
the data logger
The pattern of
temperature and
humidity changes
can be observed on
the same graph
More than one sensor can
be used simultaneously
(humidity and
temperatures sensor)
It can save our
time since the
experiments do
not take a long
period.
18. Conclusion
Data logger is an electronic device that records data over
time or in relation to location either with a built in instrument
or sensor or via external instruments and sensors. It really
gives a lot of advantages. For example measurements are
always taken at the right time when using data logger.
Unlike a human, the computer will not forget to take a
reading or take a reading too late or too early. Mistakes are
not made in reading the results. Humans can make errors.
Data logging devices can be sent to places that humans
can not easily get to. Such as to the planet Mars, into the
bottom of a volcano, or onto a roof of a tall building to get to
a weather station. Graphs and tables of results can be
produced automatically by the data logging software.
