Photosynthesis Lab - Hour 6 by Jeremy Mohn https://padlet.com/jmohn/a0feg7zc8opm Group 2 - Light Intensity en-us 2016-10-15 20:50:12 UTC 2025-09-30 12:58:30 UTC hello@padlet.com http://d20uo2axdbh83k.cloudfront.net/20141020/47034972b1207c3982eed5f412f5322b.gif Graph jmohn https://padlet.com/jmohn/a0feg7zc8opm/wish/130936527 2016-10-15 20:50:12 UTC https://padlet.com/jmohn/a0feg7zc8opm/wish/130936527 Hypothesis/Prediction jmohn https://padlet.com/jmohn/a0feg7zc8opm/wish/130936528 Hypothesis: The leaves with less light exposure will have a slower rate of photosynthesis.

Prediction: If the intensity of the light is decreased, then the rate of photosynthesis will also decrease.
]]> 2016-10-15 20:50:12 UTC https://padlet.com/jmohn/a0feg7zc8opm/wish/130936528 Research Question jmohn https://padlet.com/jmohn/a0feg7zc8opm/wish/130936529 How does light intensity effect the rate of photosynthesis in spinach leaves?]]> 2016-10-15 20:50:12 UTC https://padlet.com/jmohn/a0feg7zc8opm/wish/130936529 Procedure jmohn https://padlet.com/jmohn/a0feg7zc8opm/wish/130936530
  • Gather lab materials.
  • Prepare 300mL of 0.2% bicarbonate solution.
  • Pour the solution into a clear cup.
  • Punch out 10 leaf chads.
  • Put the chads into syringe filled with the sodium bicarbonate solution and use the syringe to get the gases out of the chads by creating a vacuum so they will sink.
  • Prepare proper experimental conditions, (light source, PAR sensor)
  • Put the leaf chads into the cup for photosynthesis. Make sure an even number sink and take the rest out of the cup. Begin timing.
  • Measure the light intensity using the PAR sensor.
  • Once half of the chads have floated to the top record the elapsed time.
  • Analyze and record data. Graph the experimental findings. (light intensity vs ET50)
  • Repeat steps but add a layer of light screen on top of the cup
    • ]]>     2016-10-15 20:50:12 UTC https://padlet.com/jmohn/a0feg7zc8opm/wish/130936530     Conclusion jmohn https://padlet.com/jmohn/a0feg7zc8opm/wish/130936531 The researcher's hypothesis state that if the intensity of the light is decreased, then the rate of photosynthesis will decrease. This was clearly proven to be true as shown by the amount of time per trial in the data. The shortest time was for the trial without a window screen at 13:26.  The longest time was for the trail with two window screens at 30:31.  The chads that had no window screen above them were exposed to the greatest intensity of light, which allowed for the rate of oxygen production to increase.  Oxygen is a product of photosynthesis, which has a direct correlation to the rate of photosynthesis.

    There were multiple sources of error to go along with this experiment. One of the many errors was the fact that the cups were not fully centered under the light. This could impact the rate of photosynthesis because each cup got a different amount of light. Another error could be that the screens may have overlapped at some point. This could affect the results because light may have had to pass through more than 2 window screens , which definitely could have reduced the light intensity. This experiment could be used in the future to find the best and worst conditions for photosynthesis.]]>     2016-10-15 20:50:12 UTC https://padlet.com/jmohn/a0feg7zc8opm/wish/130936531     Results jmohn https://padlet.com/jmohn/a0feg7zc8opm/wish/130936532 The results of the experiment were fairly linear. The intensity of the light was changed by the amount of window screens put over the cup that contained the chads for photosynthesis, so we could not directly control the numerical value of the intensity. The trend of the graph generally followed a constant line with our data we obtained.]]> 2016-10-15 20:50:12 UTC https://padlet.com/jmohn/a0feg7zc8opm/wish/130936532 The Effect of Light Intensity on Photosynthetic Spinach Leaves jmohn https://padlet.com/jmohn/a0feg7zc8opm/wish/131552463 Names: Emory, Chris, Connor & Christian]]> 2016-10-18 16:50:20 UTC https://padlet.com/jmohn/a0feg7zc8opm/wish/131552463