Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

megalover119 Group Title

Leaf disk lab...

  • one year ago
  • one year ago

  • This Question is Closed
  1. megalover119 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    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?

    • one year ago
  2. Frostbite Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Well provide some info about this "leaf disk lab"-thingy and we can take a look at it.

    • one year ago
  3. megalover119 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    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.

    • one year ago
  4. megalover119 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    This is my lab procedure and results that I wrote up!

    • one year ago
  5. megalover119 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you!

    • one year ago
  6. wach Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I'm familiar with this lab.

    • one year ago
  7. karatechopper Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I did this earlier! I have lab report on it if you want to see..

    • one year ago
  8. megalover119 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @karatechopper that would be lovely! i would love to see if my results are typical haha

    • one year ago
  9. karatechopper Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Wait u got 0 all the way thru right? Its the same my lab group got haha

    • one year ago
  10. karatechopper Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    • one year ago
  11. megalover119 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @karatechopper okay good! thanks

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.