Animal Oxygen Consumption Lab Report Example | Topics and Well Written Essays - 2000 words

Animal Oxygen Consumption - Lab Report Example After series of tests and manipulation, the investigator found out that, oxygen consumption of the group's subject which is the "Tilapia" increases, as incubation period increases; however, the former was found to have no direct relationship with its body weight. The result was contrasting to the experience of other groups which were assigned to investigate "crayfishes". Direct or linear relationship among crayfishes' oxygen consumption, incubation time and body weight were not as well established. All living cells need energy from exterior sources to act upon their many important tasks such as biosynthesis, transportation of molecules across membranes, movement, and reproduction. Green plants for example, acquire vast amount of energy from sunlight through photosynthesis. Chloroplasts surrounding the cell matrix convert solar energy into chemical energy. Moreover, most animals ingest food (usually plants and other animals) to acquire chemical energy that are stored in the food at the same time generate ATP through a process called cellular respiration. Cellular respiration in the same manner requires oxygen as a reactant. Thus, as an outcome of cellular respiration and cellular activity, animals are able to produce and release heat. This is one of the many unique characteristics of organisms and they as well vary in the rate of heat production as part of their metabolism.The overall process of cellular respiration can be summarized as: C6H12O6 + 6 O2 6 CO2 + 6 H2O + ATP + heat (Foodstuff) (respiration) (heat) (work) Oxygen consumption was measured by estimating the energy metabolism, since the rate of oxygen consumption as well as energy utilization is generally directly related. In this exercise, the oxygen consumption of Tilapia was determined by using LaMotte Dissolved Oxygen kit in small volumes of water. This technique is titration-based on the oxidizing characteristics of dissolved oxygen (DO). Manganese solution is also added to the tested water samples followed by a strong alkali. Later, the solution was titrated through a standard solution, followed by addition of an indicator. Objectives The laboratory activity intended to achieve the following aims: 1. To demonstrate relationship in animals' body weight, oxygen consumption per body weight with respect to the incubation periods. 2. To perform accurately the procedures in the use of LaMotte Dissolved Oxygen kit, titrations and balance. 3. To compare the oxygen consumption of nektonic and benthic organisms. Hypothesis There is no direct relationship among oxygen consumption, incubation time and body weight for both animals (tilapia and crayfish). Methods/Procedures 1. Students are assigned into groups. Each group will be assigned and organism to work with depending on availability. 2. Fill 4 jars with the aquarium water. Using a net, select 3 animals of which your group is assigned to and gently transfer them one to each of the mason jars. The animals may vary in size. In addition, in the case of Tilapia, choose smaller ones so they have room to move about in the jar. *Collect water for your negative control first, since

Answer 9 questions Essay Example | Topics and Well Written Essays - 1500 words

Answer 9 questions - Essay Example different language because in most cases, word pronunciation makes a great deal in bringing our messages across no matter how wide one’s vocabulary is in a certain language. Sound production is a widely recognized problem and considered to be the most challenging part in learning a second language. Intonation and accentuation are equally challenging but do not give much problems in contrast to sound production because it is the pronunciation of the word correctly that makes one coherent. Older learners have difficulty in achieving a native-like pronunciation because they have already been used to the accent and intonation of their own tongue. This may be compared to training a plant to follow a bend that the florist desires for it to have a unique design wherein, if it is still young, the plant is easily bent while when it is already of age with its trunk hardened, there would be difficulty in bending it. Thus, if one wants to learn another language, it is best to start while he is still young and is able to develop the communication skills more effectively. Pronunciation should be taught not only in a certain period of time where the lesson is concentrated in sound formation but should be taught in all levels of the teaching process. Correction is more effective when the mistake is brought to light right then and there because the student is most aware of the mistake when he just made it. Whereas, when you let a mistake pass and try to correct it later during a spe cific pronunciation class, the student tends to forget and deny the mistake he committed. Thus, pronunciation should not be treated separately but should be taught all throughout. For beginners, I teach pronunciation separately during the first lessons. Of course it would be irrational to be teaching beginners many words that would just confuse them and worst, might scare them. Thus, I introduce my lessons systematically starting with the basic and common sounds and even giving examples to magnify