Photosynthesis Vs Cellular Respiration
Photosynthesis: A process that plants use to capture solar energy and then use it to make sugar. Photosynthesis occurs in two stages: light reactions and the Calvin Cycle. Light reactions capture solar energy, and the Calvin Cycle uses this energy to make sugar.
Chloroplast: An organelle in a photosynthetic cell in which photosynthesis takes place.
Calvin Cycle: The second stage of photosynthesis in which the solar energy captured from light reactions is used to make sugar (Bozzone, Green 194-195).
Equation: Carbon Dioxide + Water + ATP = Glucose + Oxygen
Chloroplast: An organelle in a photosynthetic cell in which photosynthesis takes place.
Calvin Cycle: The second stage of photosynthesis in which the solar energy captured from light reactions is used to make sugar (Bozzone, Green 194-195).
Equation: Carbon Dioxide + Water + ATP = Glucose + Oxygen
Cellular Respiration: Allows organisms to use energy stored in the chemical bonds of glucose. The energy in glucose is used to produce ATP (energy). Cells use this ATP to supply their energy needs.
Equation: Glucose (sugar) + Oxygen = Carbon Dioxide + Water + ATP
Equation: Glucose (sugar) + Oxygen = Carbon Dioxide + Water + ATP
![Picture](/uploads/2/8/2/4/28248195/7956287.jpg?302)
As a way to figure out whether plants do photosynthesis or cellular respiration, we designed an experiment testing the levels of both Carbon Dioxide (CO2) and Oxygen (O2) in a BioChamber testing vine maple leaves.
Experiment:
Question: How does water effect photosynthesis?
Hypothesis: If the leaves have water, then the Oxygen and Carbon dioxide gas will increase.
Materials: LabQuest, Oxygen Gas Sensor, Carbon Dioxide Gas Sensor, BioChamber 2000, vine maple leaves.
Experiment:
Independent Variable: Amount of water.
Dependent Variable: Measure of O2 and CO2 gas.
Controls: Number of leaves, type of leaves, amount of light, amount of time.
Experiment:
Question: How does water effect photosynthesis?
Hypothesis: If the leaves have water, then the Oxygen and Carbon dioxide gas will increase.
Materials: LabQuest, Oxygen Gas Sensor, Carbon Dioxide Gas Sensor, BioChamber 2000, vine maple leaves.
Experiment:
Independent Variable: Amount of water.
Dependent Variable: Measure of O2 and CO2 gas.
Controls: Number of leaves, type of leaves, amount of light, amount of time.
![Picture](/uploads/2/8/2/4/28248195/8898802.jpg?368)
Procedure:
- Get BioChamber together.
- Evenly put four vine maple leaves on the bottom of the BioChamber.
- Connect the CO2 Gas Sensor and the O2 Gas Sensor to the LabQuest.
- On the Meter screen, tap Length. Change length to 900 seconds.
- Change the unit to percentage for both CO2 and O2.
- Secure the lid on the BioChamber and insert the sensors into the holes.
- Wait about five minutes for the sensors to equilibrate, then start data collection.
- When done, sketch copies of the CO2 and O2 vs. time graphs.
- For part 2 of the experiment, remove sensors, restart LabQuest.
- Instead of putting four dry leaves on the bottom, add 6 mL of water to the bottom of the chamber.
- Repeat steps 6-8 for leaves with water.
![Picture](/uploads/2/8/2/4/28248195/3915039.jpg?368)
The graph on the left represents the leaves with H2O portion of the experiment. The top graph shows the Oxygen; starting at 20.65 percent and ending at 20.77 percent. The bottom graph shows the Carbon Dioxide; starting at 0.070 percent and ending at 0.0840 percent. This portion of the experiment also shows that photosynthesis occurred because both O2 and CO2 increased.