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1. Pour Bicarbonate into 5 clear beakers
2. Using a hole punch, cut 10 leaf disks for each different leaf
3. Using syringes remove the oxygen from the leaves by putting the disks into separate beakers, soaking up bicarbonate solution and creating a vacuum
4. To creat the vaccum place your finger over the syringe tip and pull back in the plunger. Hold this for 10 seconds. You may need to do this 2-3 times in order for all the disks to sink.
5. Pour the disks and bicarbonate back into the according beakers and place under light source
6. Record how many disks are floating in each beaker every minute for 18 minutes

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In our results, when we removed the oxygen from the plant leaves, we discovered that the spinach had the fastest rate of photosynthesis, followed by the lettuce, and finally the Christmas cactus. The other three plants (white lily, poinsettia, and aloe) that we had brought in did not rise at all during the allotted time.
We think this is because the plants are out of season, and therefore dormant. This leads us to accept our hypothesis and is proven by the data of the in-season Christmas Cactus, and the refrigerated Lettuce and Spinach. We believe that the reason that the out of season plants couldn't rise is because they were dormant, therefore not coming close to their normal rate of photosynthesis.

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Sodium Bicarbonate Solution

Light source

Syringes

6 Small Beakers

Hole Punch

Spinach Leaves, Lettuce, Poinsettia Leaves, White Lily Leaves, Aloe Leaves, Christmas Cactus Leaves

Timer

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Independent Variable: Species of Plant
Dependent Variable: Amount of Disks Floating
Control: Spinach
Experimental Group: Poinsettia, White Lily, Lettuce, Aloe, Christmas Cactus
Factors Held Constant: Type of Solution used, light intensity, number of leaf disks, temperature, color of light, time

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If the species of plant is in season, then the rate of photosynthesis will be quicker.

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Does the type of plant leaf used effect the rate of photosynthesis?