---
title: Plant Growth and Acid Rain | Understanding Environmental Impact | KnowAtom
description: Explore how acid rain affects plant growth and life cycles, emphasizing the importance of environmental changes on organisms' survival and reproduction.
---

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# Plant Growth and Acid Rain

In this unit, students focus on how environmental changes impact the ability of organisms to survive, grow, and reproduce, passing their traits on to future generations. In this lesson, students continue their analysis of how a plant’s structures allow it to grow and develop, focusing on how a change in the environment such as pollution can impact a plant’s ability to complete its life cycle. Specifically, students investigate how acid rain affects the external structures of aquatic plants. This page provides an overview of this lesson.

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- [Wyoming](https://www.knowatom.com/stem-curriculum-wyoming)
- [Other NGSS](https://www.knowatom.com/stem-curriculum-ngss)

## Science Background for Teachers:

The science background section provides teachers with more detailed information about the phenomena students explore in this unit. Below is an excerpt from the science background information on plant growth and acid rain. 

In the mid-1800s, people started noticing a connection between the locations of large industrial areas and damaged forests, observing that forests downwind of industrial plants weren’t growing as well. This was the first time acid rain had been observed. Acid rain is any form of precipitation that has high levels of nitric and sulfuric acids. It is caused primarily by the burning of fossil fuels, such as gas, oil, and coal, although a small percentage comes from natural causes, including volcanic emissions and forest fires. 

Despite being noticed in the 1800s, acid rain wasn’t considered a significant environmental threat until the 1970s, when scientists began noticing that some lakes and streams were becoming more acidic. Studying acid rain is important because too much acidity in the water harms many different living things. Acid rain is a form of pollution—any substance that has harmful effects on the environment.

Acid rain can also damage a plant’s leaves, causing them to look spotted or to drop earlier than normal. This causes the plant to become weak because leaves have most of the plant’s chloroplasts to collect sunlight and convert it into energy the plant can use to grow and develop through photosynthesis. When a plant’s leaves are damaged by acid rain, they can no longer photosynthesize as well.

Acid rain generally doesn’t kill plants directly. Instead, it damages their external structures, making it harder for them to grow and develop. For example, plants use their roots to anchor a plant in place and take nutrients and water from the soil. Scientists know that acidic water dissolves the nutrients and minerals in the soil and then washes them away before trees and other plants can use them to grow. Acid rain can also stunt root growth.

When the structures of a plant are damaged by acid rain, they are less able to complete their life cycle. A life cycle is the series of developmental stages an organism passes through on its way from birth to death. There is a pattern to the changes that all living things go through as they grow and develop. All life cycles include birth, growth, reproduction, and death.

The seed is the first step in a flowering plant’s life cycle. The seed protects the plant in a protective coat as it travels from its parent to a new location. With enough light and warmth from the sun, the seed will start to grow. During this step, the plant breaks out of its seed coat and begins to sprout, a process called germination. It grows roots, stems, and leaves. With leaves, it can capture energy from sunlight.

In the third step, the plant grows buds and flowers. Flowers are external structures where seeds form and pollination occurs. Flowers attract pollinators so the plant can make new seeds. Finally, the plant produces fruits that attract animals, or produce seed casings that allow the seed to travel by wind or water. The seeds grow and start the plant life cycle over again.

Acid rain can prevent a plant’s flowers from blooming or cause them to fall off the plant before they are pollinated. This affects a plant’s ability to reproduce. Reproduction is the ability of a mature organism to have offspring. Without reproduction, a group of organisms will die out. Because of this, reproduction is an essential step in the life cycles of all living things.

#### Supports Grade 5

![Sneak Peek Seal with Arrow](https://www.knowatom.com/hubfs/Sneak%20Peek%20Seal%20with%20Arrow.svg)

## Science Lesson: Exploring Plant Growth and Acid Rain

In this lesson, students investigate how acid rain can disrupt a plant’s life cycle by damaging its external structures.

[Download a Sample Unit ](https://www.knowatom.com/stem-curriculum#state)

## Science Big Ideas

- Plants get what they need from the environment to survive. A plant’s structures are important for helping it survive, so anything that affects the ability of the plant’s structures to develop or function will affect the overall plant’s ability to survive. 
- Acid rain is any form of precipitation that has high levels of nitric and sulfuric acids. It is caused primarily by the burning of fossil fuels, such as gas, oil, and coal. A small amount of acid rain comes from natural causes, including volcanic emissions and forest fires. 
- Pollution such as acid rain can interfere with a plant’s ability to get the materials it needs to grow and develop. Pollution is any substance that has harmful effects on the environment. 
- The damage to a plant’s structures affects its ability to complete its life cycle—the series of developmental stages an organism passes through on its way from birth to death.
- All organisms have a life cycle, which is predictable and continuous because it describes how an organism is born, grows, and reproduces, producing a new organism that will go through the same series of developmental stages.

![sample unit-k8 science curriculum-knowatom](https://www.knowatom.com/hs-fs/hubfs/Sample%20Unit%20CTA-2.png?width=327&height=264&name=Sample%20Unit%20CTA-2.png)

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## Science Essential Questions

- How do a plant’s leaves interact with the environment to support the process of photosynthesis?
- Why do plants have roots?
- What causes acid rain? Why is acid rain harmful to plants?
- How does acid rain’s effects on a plant’s leaves affect the plant’s overall ability to survive?
- How does acid rain affect the food web of the ecosystem where the plant lives?
- Why is reproduction an important part of a life cycle?
- Why do the main stages of all life cycles always follow the same direction: birth, growth, and reproduction?
- What would happen if an organism dies before it is able to reproduce?
- How does acid rain affect a flowering plant’s ability to reproduce?
- How else can acid rain affect a plant’s life cycle?

## Common Science Misconceptions

![close-circle-red](https://www.knowatom.com/hubfs/Icon%20ionic-ios-close-circle-red-1.svg) **Misconception:** The environment is static and unchanging.

![checkmark-circle-green](https://www.knowatom.com/hubfs/Icon%20ionic-ios-checkmark-circle-green.svg) **Fact:** Environments change all the time, from both natural and human causes.

## Science Vocabulary

**Acid Rain :** any form of precipitation that has high levels of nitric and sulfuric acids

**Change :** to make something different from what it is now

**Life Cycle : ** the series of developmental stages an organism passes through on its way from birth to death

**Pollution : ** any substance that has harmful effects on the environment

**Reproduction : ** the ability of a mature organism to have offspring

## Lexile(R) Certified Non-Fiction Science Reading (Excerpt)

**Studying Acid Rain**

Every year, Sarah Nelson joins a group of scientists to travel around six states in the northeastern United States. They take samples of water from 74 different lakes, from the crowded suburbs of Boston to the top of remote mountains in Maine.

Studying acid rain is important because too much acidity in the water harms many different living things. Acid rain is a form of pollution—any substance that has harmful effects on the environment.

These scientists are measuring the amount of acid rain present in the water. Acid rain is any form of precipitation that has high levels of nitric and sulfuric acids. It is caused primarily by the burning of fossil fuels, such as gas, oil, and coal. A small amount of acid rain also comes from natural causes, including volcanic emissions and forest fires.

**Acid Rain Harms Plants**

Acid rain generally doesn’t kill plants directly. Instead, it damages their external structures. This makes it harder for them to grow and develop.

For example, plants use their roots to anchor themselves in place and take nutrients and water from the soil. Scientists know that acidic water dissolves the nutrients and minerals in the soil and then washes them away before trees and other plants can use them to grow. Acid rain can also slow down or reduce root growth.

Acid rain can also damage a plant’s leaves. It can cause them to look spotted or to drop earlier than normal. This causes the plant to become weak because leaves have most of the plant’s chloroplasts. When a plant’s leaves are damaged by acid rain, they can no longer photosynthesize as well. Remember that leaves collect sunlight and convert it into energy the plant can use to grow and develop through photosynthesis.

**Acid Rain and a Plant’s Life Cycle**

When the structures of a plant are damaged by acid rain, they are less able to complete their life cycle. A life cycle is the series of developmental stages an organism passes through on its way from birth to death.

There is a pattern to the changes that all living things go through as they grow and develop. All life cycles include birth, growth, reproduction, and death. The seed is the first step in a flowering plant’s life cycle. The seed protects the plant in a protective coat as it travels from its parent to a new location.

With enough light and warmth from the sun, the seed will start to grow. During this step, the plant breaks out of its seed coat and begins to sprout. This is called germination. It grows roots, stems, and leaves. With leaves, it can capture energy from sunlight.

![plant-growth-and-acid-rain](https://www.knowatom.com/hs-fs/hubfs/plant-growth-and-acid-rain.jpg?width=261&height=340&name=plant-growth-and-acid-rain.jpg)

![plant-growth-and-acid-rain1](https://www.knowatom.com/hs-fs/hubfs/plant-growth-and-acid-rain1.jpg?width=261&height=340&name=plant-growth-and-acid-rain1.jpg)

![plant-growth-and-acid-rain2](https://www.knowatom.com/hs-fs/hubfs/plant-growth-and-acid-rain2.jpg?width=261&height=340&name=plant-growth-and-acid-rain2.jpg)

## Hands-on Science Activity

Students develop an experiment to figure out how much increasing levels of acid rain in water affects the external structures of aquatic plants. Students collect data over a a short period of time to analyze the connection between an environmental change and an organism’s ability to survive.

[ Learn More About KnowAtom ](https://www.knowatom.com/stem-curriculum)

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- Concept Map Assessment 
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![ecosystem-interaction-map](https://www.knowatom.com/hs-fs/hubfs/ecosystem-interaction-map.jpg?width=397&height=505&name=ecosystem-interaction-map.jpg)

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** Standards Tags: ** [5-LS1-1](https://www.knowatom.com/5-ls1-1) , [3-LS1-1](https://www.knowatom.com/3-ls1-1) , [4-LS1-1](https://www.knowatom.com/4-ls1-1) , [5-LS2-2](https://www.knowatom.com/5-ls2-2) , [3-LS4-5 (MA)](https://www.knowatom.com/3-ls4-5-ma) , [3-LS4-4](https://www.knowatom.com/3-ls4-4) , [3.2.2](https://www.knowatom.com/3.2.2) , [3.2.3](https://www.knowatom.com/3.2.3) , [4.1.1](https://www.knowatom.com/4.1.1) , [5.3.1](https://www.knowatom.com/5.3.1) , [3.LS1.1](https://www.knowatom.com/3.ls1.1) , [3.LS4.1](https://www.knowatom.com/3.ls4.1) , [4.LS2.1](https://www.knowatom.com/4.ls2.1) , [S3L1](https://www.knowatom.com/s3l1) , [S3L2](https://www.knowatom.com/s3l2) , [S4L1](https://www.knowatom.com/s4l1) , [S5L4](https://www.knowatom.com/s5l4) , [3.L1U1.5](https://www.knowatom.com/3.l1u1.5) , [3.L1U1.8](https://www.knowatom.com/3.l1u1.8) , [5.L3U1.10](https://www.knowatom.com/5.l3u1.10) , [5.L4U3.11](https://www.knowatom.com/5.l4u3.11) , [5.L4U3.12](https://www.knowatom.com/5.l4u3.12) , [3L.1.2.1.2](https://www.knowatom.com/3l.1.2.1.2) , [3L.4.2.1.1](https://www.knowatom.com/3l.4.2.1.1) , [4L.4.2.1.2](https://www.knowatom.com/4l.4.2.1.2) , [5L.1.2.1.4](https://www.knowatom.com/5l.1.2.1.4) , [3.LS1.B.1](https://www.knowatom.com/3.ls1.b.1) , [4.LS1.A.1](https://www.knowatom.com/4.ls1.a.1) , [5.LS1.C.1](https://www.knowatom.com/5.ls1.c.1) , [3-LS3-1](https://www.knowatom.com/3-ls3-1) , [3-LS3-2](https://www.knowatom.com/3-ls3-2) , [3-LS4-3](https://www.knowatom.com/3-ls4-3) , [3.1.3.G](https://www.knowatom.com/3.1.3.g) , [3.1.4.A](https://www.knowatom.com/3.1.4.a) , [3.1.5.A](https://www.knowatom.com/3.1.5.a) , [3.4.3-5.B](https://www.knowatom.com/3.4.3-5.b) , [3.LS.3](https://www.knowatom.com/3.ls.3) , [4.LS.1](https://www.knowatom.com/4.ls.1) , [5.LS.2](https://www.knowatom.com/5.ls.2) , [3-LS4-2](https://www.knowatom.com/3-ls4-2) , [Asking questions and defining problems](https://www.knowatom.com/asking-questions-and-defining-problems) , [Developing and using models](https://www.knowatom.com/developing-and-using-models) , [Planning and carrying out investigations](https://www.knowatom.com/planning-and-carrying-out-investigations) , [Analyzing and interpreting data](https://www.knowatom.com/analyzing-and-interpreting-data) , [Constructing explanations and designing solutions](https://www.knowatom.com/constructing-explanations-and-designing-solutions) , [Engaging in argument from evidence](https://www.knowatom.com/engaging-in-argument-from-evidence) , [Obtaining evaluating and communicating information](https://www.knowatom.com/obtaining-evaluating-and-communicating-information) , [Organization for Matter and Energy Flow in Organisms](https://www.knowatom.com/organization-for-matter-and-energy-flow-in-organisms) , [Growth and Development of Organisms](https://www.knowatom.com/growth-and-development-of-organisms) , [Structure and Function](https://www.knowatom.com/structure-and-function) , [Energy and Matter](https://www.knowatom.com/energy-and-matter) , [Patterns](https://www.knowatom.com/patterns) , [Systems and System Models](https://www.knowatom.com/systems-and-system-models) , [From Molecules to Organisms: Structures and Processes 5](https://www.knowatom.com/from-molecules-to-organisms-structures-and-processes-5) , [Heredity: Inheritance and Variation of Traits 8](https://www.knowatom.com/heredity-inheritance-and-variation-of-traits-8) , [Unity and Diversity 11](https://www.knowatom.com/unity-and-diversity-11) , [From Molecules to Organisms: Structures and Processes 9](https://www.knowatom.com/from-molecules-to-organisms-structures-and-processes-9) , [Ecosystems: Interactions Energy and Dynamics 9](https://www.knowatom.com/ecosystems-interactions-energy-and-dynamics-9) ,

### Supports Grade 5

#### Science Standards

- [5-LS1-1](https://www.knowatom.com/5-ls1-1)
- [3-LS1-1](https://www.knowatom.com/3-ls1-1)
- [4-LS1-1](https://www.knowatom.com/4-ls1-1)
- [5-LS2-2](https://www.knowatom.com/5-ls2-2)
- [3-LS4-5 (MA)](https://www.knowatom.com/3-ls4-5-ma)
- [3-LS4-4](https://www.knowatom.com/3-ls4-4)
- [3.2.2](https://www.knowatom.com/3.2.2)
- [3.2.3](https://www.knowatom.com/3.2.3)
- [4.1.1](https://www.knowatom.com/4.1.1)
- [5.3.1](https://www.knowatom.com/5.3.1)
- [3.LS1.1](https://www.knowatom.com/3.ls1.1)
- [3.LS4.1](https://www.knowatom.com/3.ls4.1)
- [4.LS2.1](https://www.knowatom.com/4.ls2.1)
- [S3L1](https://www.knowatom.com/s3l1)
- [S3L2](https://www.knowatom.com/s3l2)
- [S4L1](https://www.knowatom.com/s4l1)
- [S5L4](https://www.knowatom.com/s5l4)
- [3.L1U1.5](https://www.knowatom.com/3.l1u1.5)
- [3.L1U1.8](https://www.knowatom.com/3.l1u1.8)
- [5.L3U1.10](https://www.knowatom.com/5.l3u1.10)
- [5.L4U3.11](https://www.knowatom.com/5.l4u3.11)
- [5.L4U3.12](https://www.knowatom.com/5.l4u3.12)
- [3L.1.2.1.2](https://www.knowatom.com/3l.1.2.1.2)
- [3L.4.2.1.1](https://www.knowatom.com/3l.4.2.1.1)
- [4L.4.2.1.2](https://www.knowatom.com/4l.4.2.1.2)
- [5L.1.2.1.4](https://www.knowatom.com/5l.1.2.1.4)
- [3.LS1.B.1](https://www.knowatom.com/3.ls1.b.1)
- [4.LS1.A.1](https://www.knowatom.com/4.ls1.a.1)
- [5.LS1.C.1](https://www.knowatom.com/5.ls1.c.1)
- [3-LS3-1](https://www.knowatom.com/3-ls3-1)
- [3-LS3-2](https://www.knowatom.com/3-ls3-2)
- [3-LS4-3](https://www.knowatom.com/3-ls4-3)
- [3.1.3.G](https://www.knowatom.com/3.1.3.g)
- [3.1.4.A](https://www.knowatom.com/3.1.4.a)
- [3.1.5.A](https://www.knowatom.com/3.1.5.a)
- [3.4.3-5.B](https://www.knowatom.com/3.4.3-5.b)
- [3.LS.3](https://www.knowatom.com/3.ls.3)
- [4.LS.1](https://www.knowatom.com/4.ls.1)
- [5.LS.2](https://www.knowatom.com/5.ls.2)
- [3-LS4-2](https://www.knowatom.com/3-ls4-2)
- [Asking questions and defining problems](https://www.knowatom.com/asking-questions-and-defining-problems)
- [Developing and using models](https://www.knowatom.com/developing-and-using-models)
- [Planning and carrying out investigations](https://www.knowatom.com/planning-and-carrying-out-investigations)
- [Analyzing and interpreting data](https://www.knowatom.com/analyzing-and-interpreting-data)
- [Constructing explanations and designing solutions](https://www.knowatom.com/constructing-explanations-and-designing-solutions)
- [Engaging in argument from evidence](https://www.knowatom.com/engaging-in-argument-from-evidence)
- [Obtaining evaluating and communicating information](https://www.knowatom.com/obtaining-evaluating-and-communicating-information)
- [Organization for Matter and Energy Flow in Organisms](https://www.knowatom.com/organization-for-matter-and-energy-flow-in-organisms)
- [Growth and Development of Organisms](https://www.knowatom.com/growth-and-development-of-organisms)
- [Structure and Function](https://www.knowatom.com/structure-and-function)
- [Energy and Matter](https://www.knowatom.com/energy-and-matter)
- [Patterns](https://www.knowatom.com/patterns)
- [Systems and System Models](https://www.knowatom.com/systems-and-system-models)
- [From Molecules to Organisms: Structures and Processes 5](https://www.knowatom.com/from-molecules-to-organisms-structures-and-processes-5)
- [Heredity: Inheritance and Variation of Traits 8](https://www.knowatom.com/heredity-inheritance-and-variation-of-traits-8)
- [Unity and Diversity 11](https://www.knowatom.com/unity-and-diversity-11)
- [From Molecules to Organisms: Structures and Processes 9](https://www.knowatom.com/from-molecules-to-organisms-structures-and-processes-9)
- [Ecosystems: Interactions Energy and Dynamics 9](https://www.knowatom.com/ecosystems-interactions-energy-and-dynamics-9)

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Standards citation: NGSS Lead States. 2013. Next Generation Science Standards: For States, By States. Washington, DC: The National Academies Press. Neither WestEd nor the lead states and partners that developed the Next Generation Science Standards were involved in the production of this product, and do not endorse it.

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