Ch 43: General Science: Ecosystems

About This Chapter

The state of Arizona has replaced the AEPA General Science exam with the NES General Science exam. These lessons will help you prepare for the NES General Science exam by reviewing the different biomes, elements of ecosystems and cycles that take place in ecosystems.

AEPA General Science: Ecosystems - Chapter Summary

In your studies for the National Evaluation Series (NES) General Science exam, complete this chapter to improve your understanding of the elements that make up an ecosystem and the cycles of matter and energy in them. In this review you will watch a series of short, engaging lesson videos that are taught by professional instructors who will explain the:

  • Different types of biomes and the primary productivity of biomes
  • Ecosystem stability and biodiversity
  • Habits and ecological niches
  • Global ecology
  • Trophic levels and energy flows in food chains
  • Phosphorus cycle, nitrogen cycle and carbon cycle
  • Causes and effects of climate change
  • Ecological succession

Each lesson is mobile device compatible so that your studies are not limited to only one place. For an alternative review you may also read the lesson transcripts which will help you identify the key vocabulary of the chapter. When you finish the lessons, test your understanding of them with the lesson quizzes.

16 Lessons in Chapter 43: General Science: Ecosystems
Test your knowledge with a 30-question chapter practice test
What Is a Biome? - Definition & Types

1. What Is a Biome? - Definition & Types

If you travel around the world, you can visit dry deserts with lots of cacti, the cold arctic with little plant life, or humid tropical rainforests. These different regions on Earth are all called biomes. Continue reading to learn about different types of biomes.

Biomes: Desert, Tropical Rainforest, Savanna, Coral Reefs & More

2. Biomes: Desert, Tropical Rainforest, Savanna, Coral Reefs & More

Take a trip around the world and learn all about different biomes. Why can you only find certain plants and animals in specific places? What are the most fertile climates on Earth? Watch on to answer these and other questions.

Biomes: Tundra, Taiga, Temperate Grassland, and Coastlines

3. Biomes: Tundra, Taiga, Temperate Grassland, and Coastlines

Take a trip with us in this lesson, starting in the Pacific Ocean, traveling across California through the Central Valley and up to the peaks of the Sierra Nevada mountains. We'll learn how oceans, elevation, and people can determine which types of biomes are found in different areas and check out the Earth's most massive and oldest organisms.

Primary Productivity of Biomes

4. 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.

What is Biodiversity? - Definition and Relation to Ecosystem Stability

5. What is Biodiversity? - Definition and Relation to Ecosystem Stability

Imagine making a list of all of the species you have ever heard of; it would be an enormous list! There are many different species on this planet. This lesson will explore the diversity of species, as well as the different types of diversity and how diversity of life is essential for maintaining healthy ecosystems.

Ecosystems, Habitats and Ecological Niches

6. 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.

Global Ecology: Definition and Overview

7. Global Ecology: Definition and Overview

A large oil spill in the middle of the ocean and the release of greenhouse gases into the atmosphere are examples of environmental problems that can influence the entire planet. This lesson will explore the study of environmental problems occurring on a global scale, including the impact of globalization and current major global environmental problems.

Food Chains, Trophic Levels and Energy Flow in an Ecosystem

8. 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.

Biogeochemical Cycling and the Phosphorus Cycle

9. 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.

The Nitrogen Cycle, Acid Rain and Fossil Fuels

10. The Nitrogen Cycle, Acid Rain and Fossil Fuels

Do you know the difference between nitrite and nitrate? Do you have any clue how all the nitrogen in the atmosphere becomes usable? If you can't answer these questions, then you need to watch this lesson on the nitrogen cycle.

The Carbon Cycle and Long-Term Carbon Storage

11. The Carbon Cycle and Long-Term Carbon Storage

All living organisms have a role in the carbon cycle. Do you know you understand how humans, animals and plants use carbon? This lesson will introduce you to the carbon cycle and explain how it functions on a global scale.

Fossil Fuels, Greenhouse Gases, and Global Warming

12. Fossil Fuels, Greenhouse Gases, and Global Warming

In this video lesson, you'll learn what roles fossil fuels and greenhouse gases play in global warming, as well as what life on Earth can expect due to rising carbon dioxide levels within Earth's atmosphere.

Causes of Glaciation

13. Causes of Glaciation

Glaciation refers to being covered with glaciers. Learn about the theories behind glaciation, including the changing continental positions and the Milankovitch theory, which points to three orbital variations: eccentricity, obliquity and precession, in this lesson.

Global Climate Change: Effects and Mitigation Strategies

14. Global Climate Change: Effects and Mitigation Strategies

In this video lesson, you will learn about the potential effects of global climate change. You will also learn how some are working to better understand climate change in order to slow the rate of temperature increase on Earth.

Ecological Succession: From Pioneer to Climax Communities

15. 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.

Succession in Freshwater and Terrestrial Ecosystems

16. Succession in Freshwater and Terrestrial Ecosystems

The world's many freshwater and terrestrial ecosystems are constantly changing. This lesson will discuss how these ecosystems change over time and how they recover after disturbances occur.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
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