anonymous
  • anonymous
Leaf disk lab...
Biology
chestercat
  • chestercat
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anonymous
  • anonymous
The leaf disk lab dealing with photosynthesis is very popular and you can easily find the procedure and results online. I did the lab and got good results. However I need help with these lab report questions: 4. How do the numbers of floating disks correspond to the rate of photosynthesis? 5. What causes leaf disks to float? 6. What happened to cause the leaf disks to sink? 7. What purpose did the baking soda serve in this experiment?
Frostbite
  • Frostbite
Well provide some info about this "leaf disk lab"-thingy and we can take a look at it.
anonymous
  • anonymous
Procedure: 1. Cut out 5 uniform holes out of a leaf with a hole puncher. 2. In the glass bowl, measure out 1 cup of water and then add 1 teaspoon of baking soda. 3. Place the five leaf disks into the barrel of the syringe. 4. Replace the plunger and be sure not to squish the leaf disks. Push on the plunger until only a small volume of air and leaf disks remain in the barrel. 5. Place the tip of the syringe in the baking soda solution and pull back on the plunger. Draw in about 15 mL of the solution. Tap the syringe to make sure all of the leaf discs are suspended. 6. Hold the syringe upward and expel the air by pushing the plunger until solution comes out. 7. Seal the tip of the syringe with your thumb and hold tightly. Pull back on the plunger to create a vacuum. Hold this for 10 seconds. 8. While still holding the vacuum in the syringe, swirl the leaf disks in the solution. The solution will fill in the air spaces in the leaf and cause the disks to sink. 9. Holding the syringe upwards, release the plunger and tip to release the vacuum. 10. Repeat steps 7-9 if the leaf disks did not sink to the bottom. 11. Place the syringe plunger side down on the work surface 15-20 cm from the lamb. 12. Being timing the experiment as soon as the lamp is turned on. Record the number of disks that are floating at the top of the solution at the end of each minute in your data table. After each minute, tap the side of syringe to make sure disks are not sticking to the sides. 13. Continue timing until all five disks are floating. 14. Repeat steps 1-11 with 5 new leaf disks. Place the syringe plunger side up and cover with the large bowl, bucket, or cup to prevent the exposure to light. 15. Being timing the experiment, recording the number of disks that are floating at the end of each minute and then quickly covering it back up. 16. Continue timing and observing for 15 minutes. Record all observations in the data table. Data: Time (minutes) Number of disks floating (light) Number of disks floating (Dark) 1 1 0 2 1 0 3 2 0 4 2 0 5 2 0 6 3 0 7 3 0 8 4 0 9 4 0 10 5 0 11 Done 0 12 Done 0 13 Done 0 14 Done 0 15 Done 0 Conclusion: From these observations, I conclude that the disks will only float when light is present.

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anonymous
  • anonymous
This is my lab procedure and results that I wrote up!
anonymous
  • anonymous
Thank you!
wach
  • wach
I'm familiar with this lab.
karatechopper
  • karatechopper
I did this earlier! I have lab report on it if you want to see..
anonymous
  • anonymous
@karatechopper that would be lovely! i would love to see if my results are typical haha
karatechopper
  • karatechopper
Wait u got 0 all the way thru right? Its the same my lab group got haha
karatechopper
  • karatechopper
anonymous
  • anonymous
@karatechopper okay good! thanks

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