Photosynthesis Lab - Hour 6 by Jeremy Mohn https://padlet.com/jmohn/pi79404m4x37 Group 6 - Shape of Leaf Chads en-us 2016-10-15 20:53:46 UTC 2025-11-03 06:00:09 UTC hello@padlet.com http://d20uo2axdbh83k.cloudfront.net/20141020/47034972b1207c3982eed5f412f5322b.gif Graph jmohn https://padlet.com/jmohn/pi79404m4x37/wish/130936674 2016-10-15 20:53:46 UTC https://padlet.com/jmohn/pi79404m4x37/wish/130936674 Hypothesis/Prediction jmohn https://padlet.com/jmohn/pi79404m4x37/wish/130936675 Hypothesis: The heart-shaped chad will have a higher rate of photosynthesis

Prediction: If the heart-shaped chad has a higher rate of photosynthesis then the sunken heart-shaped chad will rise to the surface faster than the circle-shaped chad
]]> 2016-10-15 20:53:46 UTC https://padlet.com/jmohn/pi79404m4x37/wish/130936675 Research Question jmohn https://padlet.com/jmohn/pi79404m4x37/wish/130936676 Will the rate of photosynthesis change due to different leaf chad shapes?]]> 2016-10-15 20:53:46 UTC https://padlet.com/jmohn/pi79404m4x37/wish/130936676 Procedure jmohn https://padlet.com/jmohn/pi79404m4x37/wish/130936677
  • Acquire materials
  • Cut 10 circle leaf chads and 10 heart leaf chads
  • Put 2 drops of laundry detergent in a cup with 200 mL of .2% bicarbonate solution
  • Put the circle chads in one syringe and the heart chads in the other
  • Draw 10 mL of sodium bicarbonate into each syringe
  • Place finger on top of opening and draw the plunger down to create a vacuum in the syringe. Gently shake/flick the syringe to get as many of them to sink to the bottom of the syringe as possible.
  • Transfer chads from the syringe into the cup. 
  • Repeat steps 4-7 with heart chads
  • NOTE: Not all chads may sink, so try to get as many as possible to sink but make sure it is an even number so that it is easy to measure when exactly half of the chads have risen.
  • Place both cups on top of separate light pads and begin timing
  • Once 1/2 of the sunken chads rise to the top record time elapsed
  • Graph data of chad shape vs inverse of ET50
    • ]]>     2016-10-15 20:53:46 UTC https://padlet.com/jmohn/pi79404m4x37/wish/130936677     Conclusion jmohn https://padlet.com/jmohn/pi79404m4x37/wish/130936678 As suggested by our data, our hypothesis was incorrect. The heart-shaped leaf chads had a much slower rate of photosynthesis than circle-shaped leaf chads, as shown by how much longer the heart-shaped leaf took to reach the surface. This may be attributed the the difference in the surface-area to volume ratio, however, the difference between the two chad shapes is very small. This may suggest the data is not reliable, because this implies the action of the chads floating to the surface of the solution was attributed to chance. If not by chance, the circle-leaf chads may have floated to the top more quickly because the stirring of the chads was not consistent with the way the heart-shaped chads were stirred. Two different people stirred each, at different intervals, and with different methods. Other errors may also come from the circle-shaped chads having more air within them to begin with, as it may not have all been removed in the sixth step of the procedure. This would cause the circle chads to be able to rise to the top more quickly. In future experiments, the difference in chad shape should be much bigger, to ascertain statistically significant results.]]> 2016-10-15 20:53:46 UTC https://padlet.com/jmohn/pi79404m4x37/wish/130936678 Results jmohn https://padlet.com/jmohn/pi79404m4x37/wish/130936679 Our data shows, through the bar graph above, that the rate of photosynthesis in circle-shaped leaf chads was almost double the rate of the heart-shaped leaf chads. Heart-shaped leaf chads had a 1/ET50 of approximately 0.0016, while the circle chads had an 1/ET50 of .0027 ]]> 2016-10-15 20:53:46 UTC https://padlet.com/jmohn/pi79404m4x37/wish/130936679 Effect of Chad Shape on Photosynthesis Rate in Living Spinach Leaves jmohn https://padlet.com/jmohn/pi79404m4x37/wish/131553596 Names: Siri, Amelia, Ritu, Tate]]> 2016-10-18 16:53:03 UTC https://padlet.com/jmohn/pi79404m4x37/wish/131553596