1. Introduction

1.1     Background Research
Plants are often seen in rain forests and water bodies. Using these plants as a natural pollution indicator, the amount of pollution in a certain area can be identified. Since duckweeds are the majority of plants found in this population, duckweed would be a more viable choice of plants in the experiment.

Duckweed are free floating plants whose population can attain nuisance levels in Ohio ponds. Their explosive reproductive capacity can quickly cause a pond to be completely covered in the green plants in just a few weeks.

There are many ways how to figure out what is affecting the duckweeds, causing it to be harmful towards it. When the temperature is cool, massive duckweeds will die off. Removing the weed naturally, administering weed control chemicals and also installing a bubble aerator will eliminate duckweed.

Good quality water is free from disease-causing organisms, harmful chemical substances, and radioactive matter. It tastes good, is aesthetically appealing, and free from objectionable color or odor.

It should be noted that there is a difference between "pure water" and "safe drinking water". Pure water, often defined as water containing no minerals or chemicals, does not exist naturally in the environment. Under ideal conditions, water may be distilled to produce "pure" water.

Safe drinking water, on the other hand, may retain naturally occurring minerals and chemicals such as calcium, potassium, sodium or fluoride which are actually beneficial to human health and may also improve the taste of the water. Where the minerals or chemicals occur naturally in concentrations that may be harmful or displeasing, then certain water treatment processes are used to reduce or remove the substances.

In fact, some chemicals are actually added to produce good drinking water; the best examples of chemical addition are chlorine used as a disinfectant to destroy microbial contaminants, or fluoride used to reduce dental cavities. 

1.2     Research Question
An investigation on water plants serving as a bio-indicator in determining the quality of water.

1.3     Hypothesis
The poorer or more polluted the water quality, the lower the growth rate of duckweed.

1.3.1     Independent variable(s)
Amount of insecticide
Volume of oil
Volume of detergent

1.3.2    Dependent variable
The number of duckweed in each set up at the end of the experiment

1.3.3    Constants
Volume of water
Type of container used
Number of duckweed at the start of the experiment
Volume of container

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