PhotosynthesisPhotosynthesisHow do you maximize the oxygen is being How do you maximize the oxygen is being produced?produced?

Big IdeaBig IdeaStudents know plants use carbon dioxide and Students know plants use carbon dioxide and energy from sunlight to build molecules of energy from sunlight to build molecules of sugar and release oxygen.sugar and release oxygen.

The Process of The Process of PhotosynthesisPhotosynthesis

6CO2 + 6H2O C6H12O6 + 6O2

Kit Kit InventoryInventory

•Baking Soda solutionBaking Soda solution•Liquid soapLiquid soap

•Plastic SyringePlastic Syringe•Leaf materialLeaf material•Hole punchHole punch•Plastic cupsPlastic cups

•TimerTimer•Light sourceLight source

•Tin foilTin foil

Focus QuestionFocus Question

Write a testable question you can Write a testable question you can investigate about photosynthesis.investigate about photosynthesis.

Which type of plant leaf produces the most Which type of plant leaf produces the most oxygen during photosynthesis?oxygen during photosynthesis?

How does the amount light exposure affect How does the amount light exposure affect how much oxygen is produced during how much oxygen is produced during photosynthesis? photosynthesis?

How does the concentration of CO2 affect How does the concentration of CO2 affect photosynthesis?photosynthesis?

ProcedureProcedure1.1. Prepare baking soda solution (.2% & .4%).Prepare baking soda solution (.2% & .4%).

2.2. Add 1 drop of liquid soap to the solution. Try to avoid suds.Add 1 drop of liquid soap to the solution. Try to avoid suds.

3.3. Use a hole punch to cut at least 10 uniform leaf disks avoiding Use a hole punch to cut at least 10 uniform leaf disks avoiding major veins.major veins.

4.4. Remove the piston of the syringe and place the leaf disks into the Remove the piston of the syringe and place the leaf disks into the syringe barrel. Replace the piston and push until only a small syringe barrel. Replace the piston and push until only a small volume of air remains in the barrel.volume of air remains in the barrel.

5.5. Pull a small volume of baking soda/soap solution into the syringe.Pull a small volume of baking soda/soap solution into the syringe.

6.6. Holding a finger over the syringe opening, draw back the piston to Holding a finger over the syringe opening, draw back the piston to create a vacuum. While holding the vacuum, swirl the leaf disks to create a vacuum. While holding the vacuum, swirl the leaf disks to suspend them in the solution. Lift your finger off the opening. suspend them in the solution. Lift your finger off the opening.

7.7. You may need to repeat the vacuum solution until all of the disks You may need to repeat the vacuum solution until all of the disks sink.sink.

TestingTesting

Using the heat lamp, you can test to see how many disks float and sink at time intervals of 1 minute.

The number of disks that float is proportional to the amount of oxygen being produced.

Construct a table and record data.

ConclusionsConclusions

Use the conclusion template to write a draft of a conclusion about your findings.

ReflectionReflection