Photosynthesis "Floating Disk" Lab
1. Photosynthesis Equation:
6CO2 + 6H2O + energy ----> C6H12O6 + 6O2
2.
Materials:
1. 100 mL of distilled water
2. organic spinach
3. 1 gram baking soda
4. a hole puncher
5. syringe
6. beaker
Procedure:
Use the hole puncher to make about 20 chads of spinach. They were then placed into the syringe, which also sucked in water. The water was then squeezed out and the syringe handle was taken and put down. It faced forward, which allowed air to come in and out of the chads, sinking from top to bottom. The chads were emptied out of the syringe and then placed in a beaker for observation. The chads sank to the bottom of the beaker. A light was placed over the beaker, and another flask of water was also placed over the beaker. The purpose of this was to filter out the heat produced by the light. This is because only light is needed.
Independent Variable(s) - Color of light, distilled water, and baking soda.
Dependent Variable(s)- Rate of photosynthesis, the rising of leaves.
3.
One of the variables that could be tested would be the rate at which the chads sank to the bottom. You could test to see whether or not the light had an affect on the rate that they sunk. The "floating disks" would possibly be affected by either the presence of absence of light. For example, if the light sped up the rate at which the chads sunk, then it could be tested and proven that without the light, there was a slower rate.
4.
a. The purpose of the vacuum in the syringe is to take out the oxygen from the chads. This allows them to sink to the bottom. This also, then allows them to rise up when they go through photosynthesis. This is similar to plants undergoing photosynthesis and releasing oxygen as a waste product.
b. The baking soda that was placed in the water gave the leaf disks carbon dioxide, which was needed in order for them to perform photosynthesis.
c. The chads went through photosynthesis, which had them release oxygen and allowed them to float.
6CO2 + 6H2O + energy ----> C6H12O6 + 6O2
2.
Materials:
1. 100 mL of distilled water
2. organic spinach
3. 1 gram baking soda
4. a hole puncher
5. syringe
6. beaker
Procedure:
Use the hole puncher to make about 20 chads of spinach. They were then placed into the syringe, which also sucked in water. The water was then squeezed out and the syringe handle was taken and put down. It faced forward, which allowed air to come in and out of the chads, sinking from top to bottom. The chads were emptied out of the syringe and then placed in a beaker for observation. The chads sank to the bottom of the beaker. A light was placed over the beaker, and another flask of water was also placed over the beaker. The purpose of this was to filter out the heat produced by the light. This is because only light is needed.
Independent Variable(s) - Color of light, distilled water, and baking soda.
Dependent Variable(s)- Rate of photosynthesis, the rising of leaves.
3.
One of the variables that could be tested would be the rate at which the chads sank to the bottom. You could test to see whether or not the light had an affect on the rate that they sunk. The "floating disks" would possibly be affected by either the presence of absence of light. For example, if the light sped up the rate at which the chads sunk, then it could be tested and proven that without the light, there was a slower rate.
4.
a. The purpose of the vacuum in the syringe is to take out the oxygen from the chads. This allows them to sink to the bottom. This also, then allows them to rise up when they go through photosynthesis. This is similar to plants undergoing photosynthesis and releasing oxygen as a waste product.
b. The baking soda that was placed in the water gave the leaf disks carbon dioxide, which was needed in order for them to perform photosynthesis.
c. The chads went through photosynthesis, which had them release oxygen and allowed them to float.
Respiration Lab
Respiration Equation:
C6H12O6 + 6O2 --> 6CO2 + 6H2O + energy
C6H12O6 + 6O2 --> 6CO2 + 6H2O + energy
3 Respirometers :
DATA TABLE 1:
Calculation of Volume in Respirometers
DATA TABLE 2:
Calculation of Oxygen Consumption
Graph of Germinating Peas:
Conclusion Questions:
1. Write a conclusion statement that relates to the state of seed germination that was demonstrated by this lab experiment and your data.
The germinating seeds respired the most, followed by the non germinating seeds and last the glass beads.
2. Graph the rate of respiration for the germinating seeds. Calculate the RATE of oxygen consumption for the germonating seeds.
The rate of oxygen consumption for the germinating seeds is -.12
0.9 - 3.3 = -2.4
-2.4/20 = -.12
3. In this lab experiment, what is the purpose of...
1. Beads- The control for the respiration (The beads will not respire; used to equalize the volume)
2. KOH- eliminate the CO2 in the respriometer by bonding.
3. Respriometer- acts as a vessel (air tight - black electrical tape) for the gauging of respiration.
The germinating seeds respired the most, followed by the non germinating seeds and last the glass beads.
2. Graph the rate of respiration for the germinating seeds. Calculate the RATE of oxygen consumption for the germonating seeds.
The rate of oxygen consumption for the germinating seeds is -.12
0.9 - 3.3 = -2.4
-2.4/20 = -.12
3. In this lab experiment, what is the purpose of...
1. Beads- The control for the respiration (The beads will not respire; used to equalize the volume)
2. KOH- eliminate the CO2 in the respriometer by bonding.
3. Respriometer- acts as a vessel (air tight - black electrical tape) for the gauging of respiration.