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Effect Of Eutrophication On Plant Growth (Duckweed)

950 words - 4 pages

Biology Practical AssignmentName of Investigation:Effect of Eutrophication on Plant GrowthResearch Question:How does the process of Eutrophication affect the growth of Duckweed?Hypothesis:In this experiment, we are basically testing the use of different fertilizers on the growth of Duckweeds. Plants need fertilizers for their growth and to increase the yield of crops. But, at the same time, it depends on which Fertilizer being used and in how much proportion. Does it have sufficient nutrients or excessive nutrients? These were the questions, which I asked myself and through some research, I was able to write my Hypothesis.According to me, at the beginning, the growth of the duckweeds would increase but slowly after 6-7 days, they would perish. Duckweeds are those types of plants that require fertilizers for the development of their roots, and Phosphorus fertilizers are the ones who have this ability. On the other hand, Nitrates or Nitrogen fertilizers in an excessive concentration would give an excessive amount of proteins to the duckweeds which would not be needed by them and hence concentrated nitrogen won't be that helpful for their growth. Tap Water would also be a good fertilizer for the duckweeds since it contains sufficient nutrients and hence would help in the growth of the plants.Reason for Hypothesis:As I mentioned on top, the plants would start to multiply as they have sufficient minerals for their growth and through constant sunlight, they would increase in numbers (except concentrated nitrates). Later on, they would slowly start to perish leaving a white color. This would happen because the plants must have used up all the minerals for a period of time, and hence due to fewer minerals they might have died. Overcrowding and the effect of Eutrophication (rapid growth) must have decreased their growth as well.Materials Required:9 Plastic ContainersLow and High concentration of NitratesLow and High concentration of PhosphatesTap Water90 DuckweedsMeasuring CylinderVariables Involved:
What will Change?

What will be kept the same?

What will be measured?

Type of Fertilizers
Concentration of Fertilizers
(Each plastic container would have a different type of fertilizer, in a different concentration)

Amount of Fertilizers
(These measures would vary from container to container but to get the most appropriate results, we are considering these factors being constant)

The increase or decrease in the number of duckweeds
(Our Aim is to measure the number of duckweeds and this is the only factor being measured every alternative day)

Method:Outline in steps how the test will be carried out, indicating how the control variables will be kept the same.First of all, we put 100ml of each fertilizer in different plastic containers-N1, N2, P1, P2, N1P1, N1P2, N2P1, N2P2, Water (Where 1 stands for low concentration and 2 stands for a higher concentration).By putting 10 duckweeds in each container, we let them expose to open...

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