April 12, 2013 Lab Report: Effects of temperature on oxygen consumption Introduction: In all animals, the acquisition of oxygen and elimination of carbon dioxide are required for survival. Oxygen is taken from the environment of the animals by diffusion from the air or water. Animals such as a fish that live in the water only have the oxygen that is dissolved in the water. A fish, exchanges gases across the secondary lamellae of their gills. Water flows over the gills and is continuously pumped by the mouth.
How does the Amount of Dissolved Oxygen Affect the Number Of Macro-organisms in Biosphere 3? Background Information: Dissolved oxygen (DO) is a relative measure of the amount of oxygen dissolved or carried in a given medium. While air is essential for all human beings to breathe, aquatic organisms such as fish, plants, and aerobic bacteria all need dissolved oxygen to respire. Adequate dissolved oxygen is necessary for good water quality. Natural stream purification processes require adequate oxygen levels in order to provide for aerobic life forms.
You should submit your document as a Word (.doc or .docx) or Rich Text Format (.rtf) file for best compatibility. Exercise 1: Data Interpretation Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organism requires oxygen to survive, it is a necessary component of water systems such as streams, lakes and rivers in order to support aquatic life. The dissolved oxygen is measured in units of ppm (parts per million). Examine the data in Table 4 showing the amount of dissolved oxygen present and the number of fish observed in the body of water the sample was taken from; finally, answer the questions below.
The guard cells lower their water potential to draw in water from the surrounding epidermal cells, by actively accumulating potassium ions. This requires ATP which, is supplied by the chloroplasts in the guard cell Gills: Fish uses gills as their gas exchange surface. Gills have a large surface area because of the numerous folds within them. The rows of gill filaments have many protrusions called gill lamellae. Water is continuously pumped through the mouth and over the gills.
This consistently increased the objects height by 0.4cm so that I could determine my volumes easily. My dependent variable was determined in two phases. First I would measure the object's weight using a weight and then while the object was in water, because it was held by the weight on a hook I could then also measure the object' weight with the same weight. The original weight of the object minus its weight in water would then equal to the buoyancy of the object. The control variables were determined like this: 1) I used water only.
Density vs. Salinity Problem: Depending on the salinity of the water sample, what number will the hydrometer read? Background Info: Salinity is the measurement of dissolved salts in water. These dissolved salts affect the total density of the water that then are dissolved in. If one knows the density of pure water and how dissolved salts affect the density of the water one ca find the salinity of the water using density. A hydrometer in an instrument that measures density by using a calibrated bobber.
Following this, we also measured the levels of pesticides in the water, whose toxic levels range between 1-10ppb and can be fatal to some fish species. Table 2 shows the results and analysis of DDT, PCBs, and Dieldrin. Table 2. Results for pesticides in water. Sample 1 2 3 Average DDT (ppt) 0.3 0.8 0.4 0.5 PCB (ppt) 0.9 0.4 0.7 0.7 Dieldrin (ppt) 0.3 0.6 0.1 0.4 We finished part I by testing the dissolved oxygen in the water.
Water safety is a very important thing to know. The residents of Montana may or may not be able to get fish from the river. Food is necessary for life. Since the presence of some ions and the amount of others can determine if water is safe for fish, or whether the water should be quarantined. The major city of Portland lies on the Columbia farther downstream, so bad water could affect many people’s lives, not just in Montana, but all the way to the Oregon-Washington border.
Research Question: To determine the effect of different concentration of Sodium bicarbonate of 1g, 2g, and 3g to the number of bubbles produced by pondweed in five minutes when submerged at 200mL distilled water at a distance of 5cm, 10cm and 15cm from the light source. Introduction to the experiment Photosynthesis is a crucial process for every plant. Every plant needs energy (ATP) for their survival. Plants use light energy to convert carbon dioxide and water into energy and oxygen. Light energy has a major role in this process.
Examples of such environmental factors include light intensity, temperature, and distance from a light source(1). Elodea condensers, also known as American water weed, is a common, aquatic plant in North American lake ecosystems. It provides both food and habitat for many aquatic life forms. Elodea can grow in a wide range of conditions, including various depths of water and in various sediment types (2). In addition to its ecological importance, Elodea is commonly sold as an aquarium plant.