Photosynthesis Lab - Hour 3 by Jeremy Mohn https://padlet.com/jmohn/jch212rtvhz7 Group 6 - Light Color en-us 2016-10-15 20:33:43 UTC 2025-10-03 16:18:52 UTC hello@padlet.com http://d20uo2axdbh83k.cloudfront.net/20141020/47034972b1207c3982eed5f412f5322b.gif Results jmohn https://padlet.com/jmohn/jch212rtvhz7/wish/130935920 The leaf chads under red light rose significantly faster than the chads under white light. In the experiment, it was found that the red light had an an E50 of about 637 seconds. The red light was measured and had a reading of 512. While it would seem that the white light had a faster rate, the 1/E50 actually shows that the rate of photosynthesis was greater with the leaf chads under the red light. This had a 1/E50 rate of .0019 while the white light had a rate of .0016.
Thus, the chads under red light had a higher rate of photosynthesis than the chads under white light.]]> 2016-10-15 20:33:43 UTC https://padlet.com/jmohn/jch212rtvhz7/wish/130935920 Conclusion jmohn https://padlet.com/jmohn/jch212rtvhz7/wish/130935921 The scientists' experiment was designed to determine if altering the color of light affected the rate of photosynthesis in leaf chads. After conducting the experiment, the results did not equate to the initial hypothesis. Chads under red light had a faster rate of photosynthesis compared to chads under white light - the opposite of what was expected. Based off external research, chlorophyll molecules in the cell absorb certain pigments of light better than others. Red light is absorbed the most by chlorophyll, resulting in a higher rate of photosynthesis.

Possible sources of error include stirring and light intensity. In order to maintain consistency, both cups were stirred at the 8 minute mark. However, stirring the cups earlier could have resulted in a faster ascent for both cups. Light intensity may have been another source of error, as the height of the light bulb was not adjusted for the varying colors of light. Further application of this experiment include research for greenhouse crop yields and other farm efficiency techniques. ]]> 2016-10-15 20:33:43 UTC https://padlet.com/jmohn/jch212rtvhz7/wish/130935921 Procedure jmohn https://padlet.com/jmohn/jch212rtvhz7/wish/130935922
  • Prepare 300ml of .2% of bicarbonate solution for two experiments. The bicarbonate will serve as a source of Carbon Dioxide for the leaf disks while there are in the solution.
  • Pour the bicarbonate into clear plastic cups to a depth of about 3 cm. Place 1 lamp with white light above the cup. Cut out 8 leaf chads.
  • Place 4 of the chads into a syringe filled with sodium bicarbonate. Use the syringe to draw the gases out of the leaf tissue by placing a thumb over the syringe opening and creating a vacuum. 
  • Pour the chads and the solution out into the cup of sodium bicarbonate. 
  • Once the chads have sunk to the bottom of the cup, begin timing their gradual ascent to the top of the cup. Record the amount of time it takes for 50%. Stir the chads at 8 minutes.
  • Repeat steps 2-5 and place a red transparency sheet over the plastic cup before starting the timer.
  • Record data and graph.
    • ]]>     2016-10-15 20:33:43 UTC https://padlet.com/jmohn/jch212rtvhz7/wish/130935922     Research Question jmohn https://padlet.com/jmohn/jch212rtvhz7/wish/130935923 How does red light affect the rate of photosynthesis in leaves?]]> 2016-10-15 20:33:43 UTC https://padlet.com/jmohn/jch212rtvhz7/wish/130935923 Hypothesis/Prediction jmohn https://padlet.com/jmohn/jch212rtvhz7/wish/130935924 Hypothesis: The chads exposed to white light will have a greater rate of photosynthesis compared to the chads exposed to red light.

    Prediction: If we compare the rate of photosynthesis in leaf chads exposed white light versus red light, then the leaf chads exposed to white light will have a higher rate of photosynthesis because of the higher energy available in white light
    ]]>     2016-10-15 20:33:43 UTC https://padlet.com/jmohn/jch212rtvhz7/wish/130935924     Graph jmohn https://padlet.com/jmohn/jch212rtvhz7/wish/130935925 2016-10-15 20:33:43 UTC https://padlet.com/jmohn/jch212rtvhz7/wish/130935925 Effects of Different Light Wavelengths on the Rate of Photosynthesis realcoolbeanz https://padlet.com/jmohn/jch212rtvhz7/wish/131502163 Names: Omar Raheel, Alishka Rojas, Anna Weigel

    ]]>     2016-10-18 15:03:45 UTC https://padlet.com/jmohn/jch212rtvhz7/wish/131502163