IB Environmental Systems and Societies Internal Assessment

소개

본 문서는 2021년 May session 최종 제출한 ESS IA로 파이널 점수 7점을 받았습니다.
Research Quesion은 "What is the impact on the dissolved oxygen level and growth of duckweed (Lemna Perpusilla Torr.) with the addition of different concentrations of sodium nitrates (NaNO3 (aq)) in an aquatic environment mesocosm?"입니다.
식물을 키우는 실험을 진행하고 싶으신 분이나 eutrophication 관련 주제로 IA를 쓰고 싶으신 분들에게 도움이 될 것 같습니다.

목차

1. Research Question

2. Background Information

3. Hypothesis

4. Variables
1) Independent Variable
2) Dependent Variable

5. Apparatus

6. Methodology
1) Manipulation and control of variable
2) Risk Assessment
3) Choice of Data Processing and Presentation

7. Data Collection

8. Data Processing

9. Analysis

10. Conclusion

11. Evaluation
1) Strengths of the experiment
2) Weaknesses and limitations of the experiment
3) Suggestions for improvement

12. Application

본문내용

Research Question
What is the impact on the dissolved oxygen level and growth of duckweed (Lemna Perpusilla Torr.) with the addition of different concentrations of sodium nitrates (NaNO3 (aq)) in an aquatic environment mesocosm?

Background Information
Eutrophication is an excessive plant and algal bloom due to increased limiting growth factors such as sunlight, carbon dioxide, and nutrient fertilizers (Chislock F, 2013). Eutrophication has become a serious environmental problem since algal blooms can contaminate drinking water, and produce extremely dangerous toxins that can damage people and animals. Additionally, algal blooms can create dead zones, which are anoxic areas in aquatic environments caused by excessive nutrient pollution from human activities (NOAA, 2012). For harmful algal blooms to occur, sunlight, slow-moving water, and nutrients such as nitrogen and phosphorus are required (EPA, 2017).

참고자료

· Chislock F, Doster E, Zitomer A, Wilson E, (2013). Eutrophication: Causes, Consequences, and Controls in Aquatic Ecosystems. Nature Education Knowledge 4(4):10. Retrieved from: https://www.nature.com/scitable/knowledge/library/eutrophication-causesconsequences-and-controls-in-aquatic-102364466
· ubchem, (August 8th 2005). SODIUM NITRATE. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/24268#section=Top National Oceanic and Atmospheric Administration. (June 20, 2012). NOAA: Gulf of Mexico ‘dead zone’ predictions feature uncertainty. Retrieved from: http://www.noaanews.noaa.gov/stories2012/20120621_deadzone.html
· Patricia L, (November 7th, 2010). Solution To The Problem Of Eutrophication. Retrieved from: https://www.essays24.com/Science/SolutionS-To-The-Problem-OfEutrophication/8899.html
· Patricia M, (October 29th 2012). Eutrophication. Retrieved from: http://people.oregonstate.edu/%7Emuirp/eutrophi.htm
· Pew Trusts. (March 1st, 2006). The Eutrophication Process. Retrieved from: http://www.motherjones.com/environment/2006/03/eutrophication-process/#
· United Nations Environment Programme. (n. d.). Where Nutrients Come From and How They Cause Entrophication. Retrieved from: http://www.unep.or.jp/ietc/publications/short_series/lakereservoirs-3/3.asp
· United States Environmental Protection Agency. (April 7th 2017). Harmful Algal Blooms. Retrieved from: https://www.epa.gov/nutrientpollution/harmful-algal-blooms
· Zhang H, (August 19th 2013). Eutrophication a growing problem in China’s lakes. Retrieved from: http://english.cntv.cn/program/china24/20130819/102195.shtml