Ch 18: Holt McDougal Modern Biology Chapter 18: Introduction to Ecology

About This Chapter

The Introduction to Ecology chapter of this Holt McDougal Modern Biology textbook companion course helps students learn essential modern biology lessons on ecology. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Introduction to Ecology textbook chapter.

How it works:

  • Identify the lessons in the Holt McDougal Modern Biology Introduction to Ecology chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the introductory ecology topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Levels of ecology, ecosystems and the environment
  • Ecological niches
  • Food chains, trophic levels and energy flow
  • Primary productivity of biomes
  • The water cycle
  • Biogeochemical cycling and the phosphorus cycle
  • The nitrogen cycle
  • The carbon cycle

Holt McDougal Modern Biology is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with Study.com.

8 Lessons in Chapter 18: Holt McDougal Modern Biology Chapter 18: Introduction to Ecology
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.

Realized Niche: Example & Definition

2. Realized Niche: Example & Definition

Every organism is adapted to environmental conditions in its habitat. However, it sometimes faces competition with other species that limits the conditions under which it can exist. Explore how competition between species can shape an organism's niche.

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.

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.

The Water Cycle: Precipitation, Condensation, and Evaporation

5. The Water Cycle: Precipitation, Condensation, and Evaporation

This lesson discusses the processes water takes as it moves around the Earth in the water cycle. You'll get an in-depth look at condensation, precipitation, and evaporation.

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.

The Nitrogen Cycle, Acid Rain and Fossil Fuels

7. 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

8. 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.

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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