Ch 47: TExES Science 7-12: Ecosystems & Ecological Cycles

About This Chapter

This chapter's video lessons focus on ecosystems and ecological cycles. Watch and review them in preparation for answering related questions on the TExES Science 7-12 exam. Accompanying quizzes allow you to gauge what you've remembered.

TExES Science 7-12: Ecosystems and Ecological Cycles - Chapter Summary

Study this chapter's video lessons on ecosystems and ecological cycles in anticipation of taking the TExES Science 7-12 exam. The lessons consist of facts you've probably learned previously, although some information may be new to you. In part, you'll learn about the environment, ecosystems, and energy flow. Once you complete this chapter you should also be able to:

  • Explain ecology levels, ecological niches, food chains, habitats and energy flow
  • Understand predator/prey interactions and symbiotic relationships
  • Discuss ecological succession
  • Summarize the earth's biomes
  • Define biogeochemical cycling and the cycles of matter
  • Analyze the primary productivity of biomes
  • Identify the abiotic factors of an ecosystem

Lesson instructors are experts on the subject matter, and they're available to help you if you need assistance with the concepts that are presented. You can spend as much time reviewing the lessons as you want; they're conveniently self-paced. Watch the video lessons online with your mobile device. You can also print the written transcripts and worksheets to study offline.

11 Lessons in Chapter 47: TExES Science 7-12: Ecosystems & Ecological Cycles
Test your knowledge with a 30-question chapter practice test
The Environment, Levels of Ecology and Ecosystems

1. The Environment, Levels of Ecology and Ecosystems

Do you know the difference between an environment and an ecosystem? In this lesson, you'll find out what makes an environment, and what makes an ecosystem. You'll also learn what ecology is and some of the ways that scientists study ecology using organisms, populations, communities, ecosystems and even the entire biosphere.

Ecosystems, Habitats and Ecological Niches

2. Ecosystems, Habitats and Ecological Niches

Check out this video lesson to understand the many complex aspects of an ecosystem. See how animals live in habitats and survive amongst their surroundings.

Food Chains, Trophic Levels and Energy Flow in an Ecosystem

3. 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

4. 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.

Symbiotic Relationships: Mutualism, Commensalism & Parasitism

5. Symbiotic Relationships: Mutualism, Commensalism & Parasitism

If your cat or dog has ever had fleas, you've witnessed symbiosis in action. In this lesson, learn the many types of symbiosis in biology, and how these relationships can have a positive, negative, or neutral effect on the individual species.

Biogeochemical Cycling and the Phosphorus Cycle

6. Biogeochemical Cycling and the Phosphorus Cycle

In this video lesson, we'll take a look at how elements large and small use other elements to grow. This is achieved through cycles. We'll look at macronutrients, trace elements and the biogeochemical and phosphorous cycles.

Cycles of Matter: The Nitrogen Cycle and the Carbon Cycle

7. Cycles of Matter: The Nitrogen Cycle and the Carbon Cycle

Matter is constantly cycled between living and nonliving parts of the environment. Processes like photosynthesis and nitrogen fixation allow the carbon and nitrogen cycles to regenerate needed substances by recycling Earth's atoms.

Ecological Succession: From Pioneer to Climax Communities

8. 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.

Overview of the Earth's Biomes

9. Overview of the Earth's Biomes

Biomes are defined both climatically and geographically as areas with similar factors, such as plants and animals, soil quality, and growing seasons. In this lesson, we'll learn about the five major categories of the Earth's biomes.

Primary Productivity of Biomes

10. Primary Productivity of Biomes

Imagine a desert, a rainforest, and a lake. All of these areas are similar in that there are plants growing in them. These areas all vary because the amount of plant production is different based on the type of habitat. This lesson will explore the concept of primary productivity and how it varies by biomes. It will also discuss the most productive biomes and the biomes that produce the least biomass.

Abiotic Factors of an Ecosystem: Definition & Examples

11. 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.

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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