Photosynthesis Lab - Hour 6 by Jeremy Mohn https://padlet.com/jmohn/mdwow2qx0pm1 Group 8 - Leaf Age en-us 2016-10-15 20:55:39 UTC 2025-10-12 14:36:56 UTC hello@padlet.com http://d20uo2axdbh83k.cloudfront.net/20141020/47034972b1207c3982eed5f412f5322b.gif Graph jmohn https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936758 2016-10-15 20:55:39 UTC https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936758 Hypothesis/Prediction jmohn https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936759 Hypothesis: The younger leaves will have a higher rate of photosynthesis.

Prediction: If the leaf is younger, then the rate of photosynthesis will be higher.
]]> 2016-10-15 20:55:39 UTC https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936759 Research Question jmohn https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936760 How does the age of the leaf affect the rate of photosynthesis?]]> 2016-10-15 20:55:39 UTC https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936760 Procedure jmohn https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936761
  • Measure 200mL of the 0.2% sodium bicarbonate solution for two labeled platic cups, one for the older leaf chads and one for the younger leaf chads.
  • Drop 2 mL of detergent into each of the plastic cups and stir the solution together. 
  • Use a hole punch to cut out 4 ivy plant chads that are further away from the branch, younger, and 4 chads closer to the beginning of the branch, older.
  • Use the syringe and your thumb to pull the plunger and extract the oxygen out of the plant leaves. This will allow the plants leaves to increase its density and sink. Make sure the leaf chads sink before putting them in the next container.
  • Put the leaf chads in the two plastic cups and place a light over the top of both cups. Start a timer and wait for half (at least 2) of the leaf chads to come up.
  • Record data after each minute while stirring the leaf chads in the plastic cups for 30 minutes total. 
  • Repeat for the older leaf chads.
    • ]]>     2016-10-15 20:55:39 UTC https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936761     Conclusion jmohn https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936762 The results from our experiment rejected our hypothesis that the younger leaf chads would have a higher rate of photosynthesis. The older leaves had a higher photosynthesis rate, which allowed them to rise to the surface with the production of oxygen gas before the younger leaves. The older leaf chads could have done better than the younger leaf chads because the younger leaf chads had photosynthesis disrupted while cutting the leaves with the hole punch. Some of the sources of error we had throughout the experiment was the amount of time the chads were left in the bicarbonate solution. The photosynthesis rate was too slow so they were left in the solution for seventh hour and 30 minutes after school to achieve our results. This could have swayed our results because the plants took much longer to photosynthesize than our results show. We also had to change our plant type and light intensity to get the experiment to work. The original leaves came from the pea plant, but we had to change to the stronger ivy leaves. In the beginning of the experiment we used the light pad and we had to switch the light source to the lamp.  ]]> 2016-10-15 20:55:39 UTC https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936762 Results jmohn https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936763 The results of our experiment show that the older leaves rose to the top of the bicarbonate solution first and have a higher rate of photosynthesis than the younger leaves.]]> 2016-10-15 20:55:39 UTC https://padlet.com/jmohn/mdwow2qx0pm1/wish/130936763 The Effect of Leaf Age on the Rate of Photosynthesis jmohn https://padlet.com/jmohn/mdwow2qx0pm1/wish/131553903 Names: Courtney Neilson, Kyle Brown, Noah Fetter]]> 2016-10-18 16:53:49 UTC https://padlet.com/jmohn/mdwow2qx0pm1/wish/131553903