Ap Biography Pre Research laboratory Essay

Ap Bio Pre Laboratory

Dissolved Oxygen and Aquatic Primary Production

By: Mayank Makwana

AP Biology

Mrs. Biondo

September 19, 2012

Design Picture

Dissolved Air:

Title: The result of the temperatures of drinking water on the focus of mixed oxygen

Hypothesis: If the temperature of the normal water is elevated, then the attention of dissolved oxygen will decrease.

|Independent Variable: Temperature of water (CВє) | |Temperatures

Light Power |Initial |Dark |100% |65% |25% |10% |2% | |Trials |1 |1 |1 |1 |1 |1 |1 | | Dependent Variable: Primary Output (Gross and Net in mg/L) Constants: Source of pond water, volume of pond water, pH of pond water, drinking water sampling containers, plastic home window screens


The endurance of all microorganisms in the world is largely dependent on air. For area dwelling microorganisms, the o2 needed simply by them is obtained from mid-air, but for organisms that live inside the water, all their oxygen needs to be obtained from the water. The amount of fresh air that these creatures can take from your water is hugely dependent upon the blended oxygen content material in the drinking water. The purpose of both experiments required for this laboratory was to begin to see the ideal state to produce the most dissolved air concentration. We all approached the task of finding the ideal condition simply by testing two different parameters in two different experiments. In the first experiment, we all tested the different temperatures of water to determine which heat produced the very best concentration of dissolved o2. In the second experiment, we all added plant life to pond water, changed the amount of lumination for each beaker (to simulate increasing depth), and then noted the mixed oxygen articles after looking forward to approximately one day to see which usually depth made the highest sum of dissolved oxygen. Inside the data all of us collected, for the 1st experiment, we found the colder water had one of the most dissolved o2 content. Intended for the second research, we found that the most lumination (least depth) had the very best dissolved oxygen concentration. Although results of your experiment are certainly not world changing, they show the deep effect of temperatures and light coverage on the your life of normal water organisms.



Dissolved Oxygen- The quantity of free air dissolved in water

Principal Productivity-The price at which organic materials (carbon containing compounds) are stored.

Net Productivity- The way of measuring the change overtime in dissolved fresh air concentration through the initial attentiveness.

In this lab, we are exploring the ideal circumstances in which blended oxygen concentrations are the greatest. To figure this kind of out our company is conducting two different experiments, in which we are testing two distinct factors. In the initial experiment, we could testing the result of temperature on the blended oxygen focus. The temperature ranges we are employing are 21Вє C, 30Вє C, and 5Вє C. In the second experiment, we are testing the dissolved fresh air concentrations at different depths adding crops to show the processes of photosynthesis and breathing. The different depths are being represented with screens that let in different amounts of lumination. We are adding 0 display layers to represent 100% lumination, 1 display screen layer to symbolize 65% lumination, 3 screen layers to represent 25% light, 5 display layers to symbolize 10% light, and almost eight screen tiers to represent 2% light. The main piece of equipment employed in both labs was a dissolved oxygen evaluation kit, which was used to test out the blended oxygen attention in the different samples. For the 1st experiment, my personal hypothesis was if the temp of the normal water is increased, then the attentiveness of mixed oxygen will certainly...