Ch 27: GRE Biology: Ecosystems, Biomes, and Habitats

About This Chapter

Refresh your knowledge of ecosystems, biomes and habitats as you prepare for the GRE Biology Test. Our brief video lessons discuss these topics in a concise and engaging manner.

GRE Biology: Ecosystems, Biomes, and Habitats - Chapter Summary

Learn all you need to know about ecosystems, biomes and habitats in short, informative lessons taught by experts in the field of biology. The lessons in this chapter cover:

  • Levels of ecology and the environment
  • Introduced and invasive species and their effect on ecological balance
  • Deserts, tropical rainforests and coral reefs
  • Tundra, temperate grasslands and coastlines

You can watch each lesson as many times as necessary to be sure you grasp the concepts discussed by our instructors. If you'd rather just review the main points of a video, use the jump feature located on the timeline. Scan the lesson transcripts to find key terms in bold and reinforce your knowledge. Be sure to take the lesson quizzes and chapter exam to give you additional preparation for related questions on the GRE Biology Test.

GRE Biology Objectives

The GRE Biology Test gives graduate school applicants the opportunity to showcase their knowledge of biology. The test is composed of 190 multiple-choice questions and is organized into three main categories: cellular and molecular biology, organismal biology, and ecology and evolution. Question topics concerning ecosystems, biomes and habitats will be found in the ecology and evolution category, with questions about ecology comprising 16% to 17% of the test.

Each question on the GRE Biology Test has five answer choices. The test is give three times per year in September, October and April in a paper format.

5 Lessons in Chapter 27: GRE Biology: Ecosystems, Biomes, and Habitats
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

Ecology is the study of organisms and how they interact with the environment they live in. Explore ecology principles and the organismal, population, community, ecosystem, and biosphere levels of ecology.

Ecosystems, Habitats and Ecological Niches

2. Ecosystems, Habitats and Ecological Niches

Habitats are areas of the ecosystem where specific organisms live, while niches are the individual roles that organisms play within the ecosystem. Discover factors that affect an animal's niche and how population density impacts an ecosystem.

How Introduced and Invasive Species Alter Ecological Balance

3. How Introduced and Invasive Species Alter Ecological Balance

Introduced species are new organisms brought into an ecological environment that affect the ecological balance of that environment. Compare and contrast characteristics of an introduced species versus an invasive species, and how both alter the ecological balance of an environment.

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

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

Different types of biomes exist around the world and cater to various species of flora and fauna. Learn about some of these types including deserts, temperate deciduous and tropical rainforests, savannas, freshwater biomes, and coral reefs.

Biomes: Tundra, Taiga, Temperate Grassland, and Coastlines

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

The Earth is made up of many different biomes, large biological communities adapted to specific regional climates. Travel across the world and explore rich biomes such as tundra, taiga, open oceans, estuaries, and temperate grasslands.

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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More Exams
There are even more practice exams available in GRE Biology: Ecosystems, Biomes, and Habitats.

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