Abstract: Apparatus:
Ice cubes
The study's goal is to see how changing the light intensity affects oxygen 1000ml glass beaker
Weighing device
bubble generation in pondweed. The hypothesis was that varying light Elodea Canadensis (pondweed) 10cm
stopwatch
intensities would have a substantial effect on pondweed's rate of oxygen Thermometer
paper
generation. At various light intensities and temperatures, the length of an Burette
Pen
oxygen bubble formed in 3 minutes was measured. The results of the Lamp
pencil
practical demonstrated that varied light intensities have a substantial Ruler (30 cm)
effect on the rate of oxygen synthesis in pondweed. The hypothesis Sodium hydrogen carbonate 5%
presented in the practical has been proven, while the null hypothesis has Method:
been rejected. Following the practical, a bar graph was created to Before doing the experiment, the pondweed sho
determine the trends between the light source and the pondweed when inserting the elodea pondweed (10cm) in the inv
forming oxygen bubbles at various distances. The rate of oxygen synthesis beaker containing water. Place the lamp in the p
reduced as the light intensity fell by increasing the distance between the practical will be performed, such as on the table
pondweed and the light. Another factor that was employed in the it faces the pondweed. Place the burette on the
practical was temperature, which was 15 degrees and 25 degrees. It was tap water. Calibrate the weighing balance, then a
revealed in the result table and bar graph that increasing the sodium hydrogen carbonate (NaHCO3) on the to
temperature also extended the length of the oxygen bubble. only correcting it to two decimal places. Add the
the 1000cm3 beaker and slowly pour in the wate
Introduction: the water level just above the funnel to create a
Photosynthesis is essential to all plants like pondweed the Investigate the rate prevent oxygen loss during the experiment. place
photosynthesis occurs when the plants take in carbon of oxygen production beaker (1000cm3) at a controlled room tempera
dioxide and water from the surrounding air. Inside the concentration of 5% sodium hydrogen carbonate
in pondweed
pondweed there are chlorophyll which absorbs sunlight to the large beaker and keep it at 15 degrees during
produce oxygen and glucose the formula for photosynthesis on the lamp, place a big beaker (1000mL) betwe
equation is (Carbon dioxide + water= glucose + oxygen) By Mohammed Salam This avoids heat from the lamp source from affec
6CO2 + 6H2O = C6H12O6 + 6O2 the oxygen that are produced results. As soon as the lamp is switched on, start
from the photosynthesis are just by-products which benefits for 3 minutes to ensure the pondweed gets adju
to all life forms on earth. When pondweed produce oxygen, After 3 minutes of establishing the pondweed's s
it forms bubbles in the water and released into the experiment by setting the timer to 3 minutes. Aft
surroundings in the water. and turn off the lamp, then use the burette scale
The length of an oxygen bubble should be measu
bubbles are measured by obtaining the initial an
readings should then be obtained by calculating
table with the lengths of the bubbles. Remove th
rinse the water out of the burette, and refill with
Conclusion: Statistical back, using the metre ruler for better precision, t
timer for 3 minutes to allow the pondweed to ac
In contrast, the experiment revealed that as the distance between the
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