KUMPULAN 3 (INKUIRI BERPANDU) PROBLEM STATEMENT : What is the effect of carbon dioxide concentration on the rate of photosynthesis? AIM : To study the effect of carbon dioxide concentration on the rate of photosynthesis. HYPOTHESIS : The higher carbon dioxide concentration, the higher the rate of photosynthesis. VARIABLES : a) Manipulative : Concentration of sodium hydrogen carbonate solution b) Responding : Number of gas bubbles that are released in 1 minutes (rate of photosynthesis) c) Constant : Type and size of plant, distance of apparatus set up (Hydrilla sp.) and light bulb, temperature of water MATERIALS AND APPARATUS : Hydrilla sp., 0.5% sodium hydrogen carbonate solution, 2.0% sodium hydrogen carbonate solution, distilled water, plasticin, 60Watt light bulb, 500ml beaker, test tubes, glass funnel, stopwatch, knife, thermometer and metre ruler. PROCEDURE : 1. The plant is placed in a glass funnel and put into the base of a beaker. 2. A plasticine is used to secure the glass funnel at the bottom of the beaker. 3. 0.5% sodium hydrogen carbonate solution is filled into the beaker. 4. A test tube is put to stand in a beaker of water to make sure the temperature is constant. 5. A light source is placed 10cm away facing the test tube. 6. The light source is power on and observation were made. A one minute bubble count is made when the rate of bubbles given out is constant.
KUMPULAN 3 (INKUIRI BERPANDU)PROBLEM STATEMENT : What is the
effect of carbon dioxide concentration on the rate of
photosynthesis?AIM : To study the effect of carbon dioxide
concentration on the rate of photosynthesis.HYPOTHESIS : The higher
carbon dioxide concentration, the higher the rate of
photosynthesis.VARIABLES :a) Manipulative : Concentration of sodium
hydrogen carbonate solutionb) Responding : Number of gas bubbles
that are released in 1 minutes (rate of photosynthesis)c) Constant
: Type and size of plant, distance of apparatus set up (Hydrilla
sp.) and light bulb, temperature of waterMATERIALS AND APPARATUS
:Hydrilla sp., 0.5% sodium hydrogen carbonate solution, 2.0% sodium
hydrogen carbonate solution, distilled water, plasticin, 60Watt
light bulb, 500ml beaker, test tubes, glass funnel, stopwatch,
knife, thermometer and metre ruler.PROCEDURE :1. The plant is
placed in a glass funnel and put into the base of a beaker.2. A
plasticine is used to secure the glass funnel at the bottom of the
beaker.3. 0.5% sodium hydrogen carbonate solution is filled into
the beaker.4. A test tube is put to stand in a beaker of water to
make sure the temperature is constant.5. A light source is placed
10cm away facing the test tube. 6. The light source is power on and
observation were made. A one minute bubble count is made when the
rate of bubbles given out is constant.7. Step 3-6 is repeated by
using 2.0% sodium hydrogen carbonate solution.8. The result are
recorded in a table and a graph is plotted. RESULTS :CONCENTRATION
OF CARBON DIOXIDE
NUMBER OF GAS BUBBLES RELEASED PER MINUTE
0.5% Sodium hydrogen carbonate solution
1
0.2% Sodium hydrogen carbonate solution
9
DISCUSSION : 1. An assumption is made that the gas bubbles being
counted are only oxygen and represent rate of photosynthesis.2.
Sodium hydrogen carbonate solution is used to supply carbon dioxide
to the plant.3. The light intensity is limiting factor in this
experiment. CONCLUSION :The number of bubbles released affected by
the concentration of carbon dioxide. One gas bubble is released
when 0.5% sodium hydrogen carbonate but nine gas bubbles are
released when 2.0% sodium hydrogen carbonate is used. Hypothesis is
accepted.
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