Past extended essays in biology


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Since , Skyline High School IB diploma students have had the option of joining the Summer Ecology Research class as a way of completing their extended essay project.


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Feedback from past students has been very positive, with students appreciating the hands on approach to learning ecological field methods, the community building, the individualized assistance from teachers and most of all, the benefit of completing the extended essay paper before the start of a busy senior year fall quarter. Students will design and collect data related to a field ecology research problem of their choosing. We will have access to multiple watersheds and forests for data collection and exploration! Time will be set aside for students to meet with teachers related to problem question selection, experimental design, analysis and formatting of an extended essay.

Students will write the IB required reflection pieces for the extended essay. It's not all work -- we manage to have a lot of fun, laughter, team building and adventure too! Our schedule is as follows: May 21, , Tuesday, - Independent task completion 2 hours May 30, , Thursday, - Independent task completion 2 hours June 3, , Monday, - Independent task completion 2 hours June 11, , Tuesday, - Independent task completion 2 hours June 17, , Monday, - June 28, , Friday, time TBD estimate 6 hours June 30, , Sunday, am depart for Islandwood from Skyline July , , Monday-Tuesday, full days at Islandwood July 3, , Wednesday, pm, return to Skyline from Islandwood Attendance is important.

Please communicate in advance if a class session will be missed. Video by Jasmine C. Video by Eric Z, class of Grading The Summer Ecology Research course is a 0. Actions Shares. Embeds 0 No embeds. No notes for slide. Wellnitz, One of the most serious human pollution impacts has been the enrichment of freshwater with phosphate, which promotes the growth of harmful populations of Elodea waterweeds , Pediastrum boryanum green algae , and cyanobacteria blue-green algae.

This process, which converts clean lakes into polluted ones, is known as eutrophication E. Graham, M. Wilcox, Oligotrophic is a condition where the clean and clear water are found can be stream or lakes. These waters are defined by low mineral nutrient content and low primary productivity the amount of carbon fixed in photosynthesis per unit area per year , but high species diversity. Although many different kinds of phytoplankton and other organisms may occur in oligotrophic waters, they are few and far between.

Such waters produce desirable game fish and do not generate harmful algal blooms or excessive growth of weeds E. Meanwhile, eutrophic waters have a high mineral nutrient content and primary productivity, but low species diversity. Eutrophic waters are not known for good fishing unless they have been artificially stocked with fish, and people regard them as degraded waters having low quality. Eutrophic freshwaters may be crowded with fast- growing, weedy plants that may entangle swimmers, interfere with boat traffic, and shade out phytoplankton in the underlying waters.

There are many types of pollutant such as poisonous chemicals and metals, radioactive substance, toxic, pesticides and fertilizer such as nitrates and phosphates. When these pollutants dissolve in water and absorbed by algae, these can lead to dangerous food chain. This is because, when the contaminated algae are eaten by small water animal, the small water animal will be eaten by frogs or fish.

IB extended essay- biology ideas - The Student Room

When the frogs or fish eat the small water animal, they also consume the chemical contain in the algae. When human eat the fish, the dangerous chemical build up in their body too. This may lead to the birth defects or illness such as cancer as the long-time pass. Moreover, the pollutants can affect human in many ways such as drinking impure water, eating contaminated fish, bathing and swimming in polluted water as the polluted water can irritate the skin and cause serious problems such as skin cancer.

When rains fall, the rain will carry with them the chemicals on the field as a runoff. This runoff will enter the pond, lake of rivers and creates a mixture of water- chemical.

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Naturally, the pond changes over time as the eutrophication take place. The more plants grow in the water, the more the dead plant piles up on the bottom, hence the pond become shallower and warmer. As the plant matter decays increases, the oxygen levels in the water decreases. In addition, when the fertilizer contents in the pond increases, this process will speeds up. The thick layers of scum form on the surface of pond water and this prevent the sunlight to penetrate the base of the pond, hence retarded the process of photosynthesis of the base pond plant.

The died plant is decomposed by bacteria that undergoes aerobic respiration. As the time past, more plant will die because lack of oxygen. Even though phytoplankton algae are small but they are big enough to be seen though a microscope E.

Conclusion

They able to grow on the surface of water by manipulating the water motions that suspend and circulate them. This process exposes phytoplankton to a constant supply of dissolve mineral nutrients, which they absorb directly from the water. Some features that contribute the survive of the phytoplankton are the present of flagella, spines, formation of large colonies of cells, and coatings of mucilage. These features help them swim or stay afloat and defend phytoplankton from some type of hungry aquatic animals.

One of the characteristics of eutrophic water is they are cloudy because it is concentrated of suspended cyanobacteria. Lakes having persistent and enduring cyanobacterial blooms are described as hypereutrophic. Domestic animals should not be allowed to drink water having a visible blue-green bloom, and people should limit their exposure when swimming or water-skiing in such waters.

There are two different sources of river water that will be examine which are one with the source from the vegetable farm and another one is source from the domestic sewage. In order to determine which river is more polluted, I will look at the oxygen level contain in the water samples from both rivers.

This is because, the cleanliness level of water usually is depends on their enrichment of oxygen which is a very important element for an organism to sustain their life especially for the aquatic life. The technique that I will use is by measuring the oxygen level content in the water in five different places. This requires the 0.


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  • Excellent Extended Essays - Biology.
  • The time taken for the 0. The significance of this study is to know which factor affects the most massive growth of Pediastrum Boryanum so that people can aware the factor and reduce the usage of that particular factor.

    Ib Extended Essay Topics For Biology

    Hence, the pollution can be reduced. In this experiment, comparison of two rivers that each river have different factor to affect algal bloom. In river A, the source of water is originates from the domestic sewage. Figure 1 show river A Sungai Kenawar which has no algal bloom on its surface. The source of this river originates from the domestic sewage.

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    Meanwhile, in river B, the source of water is originates from the vegetable farms. This farm consist of various type of vegetables such as brinjal Solanum melogena , spinach Spinacia oleracea and sweet nail.

    Notes for various IB subjects as well as some musings on Biochemistry and Oncology

    These types of vegetables consume commercial fertilizers which consist of fertilizers nutrient ratio which is commonly used by the gardener is a fertilizer with a ratio of Nardozzi. This ratio indicates of the ratio of nitrogen, phosphate and potash and it is considered as a complete fertilizer because it contains all nutrients needed by the plants to grow. On the surface of the water of river B, it can be seen a layer of green algae. The source of this river is originates from the vegetables farm that consumes commercials fertilizers.

    Figure 3 show the three types of vegetables that are planted in the vegetable farms. From the left, image A is brinjal Solanum melogena , image B is spinach Spinacia oleracea and image C is swamp cabbage Ipomoea aquatica. It can be seen that on the soil, there are fertilizers on it. Five samples in three trials in three different points along the river are taken.

    This water samples is then kept in the reagent bottles to make sure there is no additional of oxygen or oxidation process occur. Massive growth of Pediastrum Boryanum can be influenced by certain factor such as nourish of nutrition from certain fertilizers commercial fertilizers.

    The collected samples of river water are then tested by 0. The higher the BOD, the lower the concentration of dissolve oxygen in that water. Hence, the water is claimed as polluted. The faster the time of the 0. The variables that are being controlled are the concentration of the methylene blue solution and the volume of water samples.

    past extended essays in biology Past extended essays in biology
    past extended essays in biology Past extended essays in biology
    past extended essays in biology Past extended essays in biology
    past extended essays in biology Past extended essays in biology
    past extended essays in biology Past extended essays in biology
    past extended essays in biology Past extended essays in biology
    past extended essays in biology Past extended essays in biology
    past extended essays in biology Past extended essays in biology
    Past extended essays in biology

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