Liquid Substances that Pollute Plants Final project

Sarita Benitez - Cler Aguirre - Stephen Hernández - Giancarlo Monsivais - Eduardo Hernández - Enrique Cantú


Plants can be harmed by pollution in a direct and indirect way. Indirect pollution means that the plants are affected by the pollution that other factors are creating. For example: Starting the car’s engine, this doesn’t affect directly the plant but it harms it because of the air pollutants that arise. In this case we will focus on the pollutants that harm the plants in a direct way. The direct pollution means that the pollutant is affecting directly the plants, like when you put directly a chemical to a flower and the flower immediately gets polluted. In our daily lives we tend to pour certain liquids to the plants in order to get rid of the substance and throw away the container. For example: When you pour the coke to the tree that is next to you in order to put the can in the trash can that said “aluminum” and recycle. The objective of this investigation is to make people conscious about the damage we cause when we pour liquids unconsciously to any plant that is around us.

Previous Knowledge

The historical knowledge of how liquids can affect in a certain way plants, is not a very large explanation, it’s basically the fact that every liquid in contact with plants, may affect the manner this plant develops and grows. Soil pollution may alter plants’ metabolism and reduce crop yields. Also, trees and plants may absorb soil contaminants and pass them up the food chain. Polluted water is also one of the main causes that kill plants, an example of this is the acid rain. Rain become acid when sulfur dioxide and nitrogen oxide react to form sulphuric acid and nitric acid. The acidic water alters the pH of the soil where plants are growing, disappearing vital minerals and taking them away. As the soil pH falls, plants will suffer various symptoms, such as yellowing between the veins on their leaves.

Problem Statement

People tend to unconsciously pour any substance to the plants and don’t realize that they are harming the plant. In this experiment we will measure the pH of healthy plants and discover how is the pH affected after receiving other substances besides water and how long does it take for the plant to show its physical changes.


Bases substances will cause more damage than acids to the plants, the plants will take at least 2 days to start showing its changes, all the plants will die except the ones that received water, and the pH levels will change in a constant way.


Most of our hypothesis were incorrect. The only one that was correct was the one that said that “bases will cause more damage than the acids”, this is because the plants that received cloralex died; while the rest of the damaged plants still have the chance to survive. Our hypothesis that stated that “the plants would take at least 2 days to start showing results” was incorrect because most of the plants took 1 day to start changing physically. The third hypothesis that said “all the plants will die except the ones that received water” was also incorrect because 2 plants that received beer and 1 that received coke have more probability to survive than the probability of dying. And finally, our last hypothesis that stated “the pH levels will change in a constant way” was wrong because all the pH levels were changing in an inconstantly.


Plants can be harmed by any liquid substance, the only substance that can keep a plant healthy in a natural way is water. The changes in the plant depends on the pH of the substances that is poured on it. If the pH is more than 7 the plant will stop growing and it won’t shrink, it will stay with the same height but it will completely dehydrate and dry. But if the pH is less than 7 the plant will start wilting, but the flowers and the leaves will still be a little hydrated so that’s why the still have the chance to be saved if you start putting some water on them.


Sarita Benitez

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