Ap Bio Pre Lab
Dissolved Oxygen and Aquatic Primary Productivity
By: Mayank Makwana
AP Biology
Mrs. Biondo
September 19, 2012
Design Diagram
Dissolved Oxygen:
Title: The effect of the temperature of water on the concentration of dissolved oxygen
Hypothesis: If the temperature of the water is increased, then the concentration of dissolved oxygen will decrease.
|Independent Variable: Temperature of water (Cº) |
|Temperatures |
Light Intensity |Initial |Dark |100% |65% |25% |10% |2% | |Trials |1 |1 |1 |1 |1 |1 |1 | |
Dependent Variable: Primary Productivity (Gross and Net in mg/L)
Constants: Source of lake water, amount of lake water, pH of lake water, water sampling bottles, plastic window screens
Abstract
The survival of all organisms in the world is largely dependent on oxygen. For land dwelling organisms, the oxygen needed by them is obtained from the air, but for organisms that live in the water, their oxygen has to be obtained from the water. The amount of oxygen that these organisms can take from the water is hugely dependent on the dissolved oxygen content in the water. The purpose of the two experiments done in this lab was to see the ideal condition to produce the most dissolved oxygen concentration. We approached the challenge of finding the ideal condition by testing two different variables in two different experiments. In the first experiment, we tested the different temperatures of water to see which temperature produced the highest concentration of dissolved oxygen. In the second experiment, we added plants to pond water, changed the amount of light for each beaker (to simulate increasing depth), and then recorded the dissolved oxygen content after waiting for approximately 1 day to see which
By: Mayank Makwana
AP Biology
Mrs. Biondo
September 19, 2012
Design Diagram
Dissolved Oxygen:
Title: The effect of the temperature of water on the concentration of dissolved oxygen
Hypothesis: If the temperature of the water is increased, then the concentration of dissolved oxygen will decrease.
|Independent Variable: Temperature of water (Cº) |
|Temperatures |
Light Intensity |Initial |Dark |100% |65% |25% |10% |2% | |Trials |1 |1 |1 |1 |1 |1 |1 | |
Dependent Variable: Primary Productivity (Gross and Net in mg/L)
Constants: Source of lake water, amount of lake water, pH of lake water, water sampling bottles, plastic window screens
Abstract
The survival of all organisms in the world is largely dependent on oxygen. For land dwelling organisms, the oxygen needed by them is obtained from the air, but for organisms that live in the water, their oxygen has to be obtained from the water. The amount of oxygen that these organisms can take from the water is hugely dependent on the dissolved oxygen content in the water. The purpose of the two experiments done in this lab was to see the ideal condition to produce the most dissolved oxygen concentration. We approached the challenge of finding the ideal condition by testing two different variables in two different experiments. In the first experiment, we tested the different temperatures of water to see which temperature produced the highest concentration of dissolved oxygen. In the second experiment, we added plants to pond water, changed the amount of light for each beaker (to simulate increasing depth), and then recorded the dissolved oxygen content after waiting for approximately 1 day to see which