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Ch 12: STAAR Science - Grade 8: Ecosystems & the Environment

About This Chapter

This chapter on ecosystems and the environment covers everything students will need to know on the subject before taking the STAAR Science - Grade 8 exam. Each lesson features professional instructors at the helm.

STAAR Science - Grade 8: Ecosystems and the Environment - Chapter Summary

This chapter delves into a wide variety of key topics related to ecosystems and the environment, bolstering student's knowledge in the area so they can go into the STAAR Science - Grade 8 test prepared for the subject. Topics covered include biotic factors, ecological balance, and food webs, in addition to the following:

  • Abiotic factors
  • Ecological succession
  • Biological themes
  • Producers, consumers, and decomposers
  • Interactions between predator and prey
  • Biological hosts
  • Human effect on the environment and pollution
  • Environmental adaptation

Students will able to stay organized through the dashboard feature and check their understanding topic-by-topic with the practice quizzes accompanying each lesson. And at the end of the chapter, the practice chapter exam offers an opportunity for students to make sure they have a firm grip on the subject as a whole.

13 Lessons in Chapter 12: STAAR Science - Grade 8: Ecosystems & the Environment
Test your knowledge with a 30-question chapter practice test
What Is an Ecosystem? - Definition & Explanation

1. What Is an Ecosystem? - Definition & Explanation

Similar to a car engine that is made up of multiple parts working together, an ecosystem has interacting parts that support a whole. But how do we define an ecosystem and what are the components they consist of?

Biotic Factor: Definition & Examples

2. Biotic Factor: Definition & Examples

This lesson focuses on the meaning of the term 'biotic factor.' It also introduces other terminology such as the words 'abiotic' and 'ecosystem'. There are real-world examples embedded in the lesson, and a brief quiz follows.

Abiotic Factors of an Ecosystem: Definition & Examples

3. Abiotic Factors of an Ecosystem: Definition & Examples

When it comes to ecosystems, a mountain, a river, and a cloud have more in common than you might think. Abiotic factors have specific and important roles in nature because they help shape and define ecosystems.

Ecological Succession: From Pioneer to Climax Communities

4. Ecological Succession: From Pioneer to Climax Communities

Just as people grow and change so, too, do ecosystems. Watch this lesson to learn about ecological succession from the beginning stages of development to a community's ultimate destination, or climax.

What Is Ecological Balance? - Definition & Importance

5. What Is Ecological Balance? - Definition & Importance

In this lesson, we'll discuss what ecological balance is and how it's important for the function of an ecosystem. We'll also explore some examples of ecological balance.

Themes in Biology: Diversity, Interdependence & Evolution

6. Themes in Biology: Diversity, Interdependence & Evolution

Biology is broadly divided into three key themes: diversity, interdependence, and evolution. We'll describe each of these themes and explain their importance to understanding life as a whole. At the end, you can test your knowledge with a brief quiz.

What is a Food Web? - Definition & Explanation

7. What is a Food Web? - Definition & Explanation

This lesson will provide a definition of a food web, as well as describe its parts and discuss examples of different types. It will also explain the transfer of energy through a food web.

Producers, Consumers & Decomposers in Ecosystems

8. Producers, Consumers & Decomposers in Ecosystems

In this lesson we will learn about producers, consumers, and decomposers. Find out what they are and how they interact with one another in the ecosystem.

Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

9. Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

You probably know that skunks can be quite stinky, bees sting and monarch butterflies are pretty, but do you know why? This lesson will introduce you to the reasons why some animals look or act the way they do and how these things relate to the predator/prey relationship.

What is a Host in Biology? - Definition & Overview

10. What is a Host in Biology? - Definition & Overview

You might be familiar with the word 'host,' but it means something very different in biology than it does when you're talking about your home. In this lesson you'll learn the biological meaning of host, and why most of the time you don't want to be one.

Human Impacts on the Environment

11. Human Impacts on the Environment

The human population continues to grow, but the size of Earth and the resources available for our use are limited. Humans greatly impact the world around them, and our actions can and often do have dramatic and long-lasting consequences.

Pollution: Physical, Chemical & Biological

12. Pollution: Physical, Chemical & Biological

Pollution is the presence of unwanted substances in an environment. It is often the result of human interference. Learn about physical, chemical and biological pollutants and see examples of each.

Environmental Changes & Adaptation in Organisms

13. Environmental Changes & Adaptation in Organisms

In this lesson, we will discuss what happens when an organism is forced to deal with environmental changes. You will learn what adaptation is and how organisms benefit from it.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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