Ch 57: TExES Core Subjects EC-6: Organisms & the Environment

About This Chapter

Examine ecological balances and relationships through the lessons in our Organisms & the Environment chapter. This chapter will be beneficial in your preparations for the science section of the TExES Core Subjects EC-6 exam.

TExES Core Subjects EC-6: Organisms & the Environment - Chapter Summary

Study the dynamics between predators and prey, how introduced species affect the ecological balance of a system and much more in these lessons. The Organisms & the Environment chapter of our TExES Core Subjects EC-6 study guide can become a powerful tool for addressing the questions on the exam. The lessons in this chapter cover the information shown in the list below and more:

  • Adaptation, natural and artificial selection and evolutionary theory
  • Definition, models and theory of population ecology
  • Role of heredity and genetics
  • Population density and survivorship
  • Competition between species and niche differentiation
  • Role of consumers, decomposers and producers
  • Understanding energy flow and food chains and impact of invasive species
  • Interactions between predator and prey and defensive mechanisms

The many-pronged approach provided by this study guide enables you to work efficiently and effectively. Our lessons are structured to allow you to move directly to those areas you want to review and skip sections with which you are already familiar. The link between the lesson quizzes and video lessons make referral back and forth easy whenever you want to check a point or an answer. Assistance from our instructors and subject matter specialists is always available to you, and the chapter tests measure your overall mastery of the material.

11 Lessons in Chapter 57: TExES Core Subjects EC-6: Organisms & the Environment
Test your knowledge with a 30-question chapter practice test
Natural Selection & Adaptation: Definition, Theory & Examples

1. Natural Selection & Adaptation: Definition, Theory & Examples

How does natural selection help shape the amazing types of animals we witness around us? In this lesson, we'll explore adaptations and what they can tell us about a species' past evolution.

Population Ecology: Definition, Theory & Model

2. Population Ecology: Definition, Theory & Model

In this lesson, learn how population ecologists study populations and their interactions with their environment. You will learn about the various terms and models they use to describe and understand this complex field of study.

Artificial Selection in Evolution

3. Artificial Selection in Evolution

Humans have been selectively breeding for desirable traits in plants and animals for a long time. This artificial selection allows for a lot of control in the breeding process but can also lead to unintended mutations within a population of organisms.

Genetic Variability and Random Mutation

4. Genetic Variability and Random Mutation

Evolution is driven by variation among populations. The amount of variability determines how well a population can adapt to environmental changes, while random mutations can provide new variations that help a population adapt to unexpected changes.

Theories of Evolution: Lamarck vs. Darwin

5. Theories of Evolution: Lamarck vs. Darwin

We'll look at the interplay between population genetics and environment. Are traits individually acquired or do entire populations evolve? The flying hamsters and a few other notable experiments will provide the answers.

Populations: Density, Survivorship and Life Histories

6. Populations: Density, Survivorship and Life Histories

Have you ever wondered how biologists determine the populations of animals in a particular geographic area? Watch this video lesson to find out, and discover how scientists look at the survivorship and life histories of many different species.

Interspecific Competition, Competitive Exclusion & Niche Differentiation

7. Interspecific Competition, Competitive Exclusion & Niche Differentiation

What happens when two similar species that consume the same resources occupy the same space? Interspecific competition, that's what! Watch our video lesson to learn about the outcomes of this ecological battle.

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.

Food Chains, Trophic Levels and Energy Flow in an Ecosystem

9. Food Chains, Trophic Levels and Energy Flow in an Ecosystem

In this lesson, you'll learn about food chains, food webs, and the different roles that organisms play in an ecosystem. You'll also learn about how energy flows through an ecosystem.

Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

10. 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.

How Introduced and Invasive Species Alter Ecological Balance

11. How Introduced and Invasive Species Alter Ecological Balance

What happens to your block when a new neighbor moves in? Something changes, right? Now think about that on an ecological scale: what happens to an environment when a new SPECIES moves in?

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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