About This Chapter
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.
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.
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.
3. 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?
4. 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.
5. 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.
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Other chapters within the GRE Biology: Study Guide & Test Prep course
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- GRE Biology: Genetic Variability, Evolutionary Processes and Consequences
- GRE Biology: Inorganic Chemistry Review
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- GRE Biology: Cell Structure & Function
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- GRE Biology: Enzymatic Biochemistry
- GRE Biology: The Cell Cycle
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- GRE Biology: Genetic Foundations
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- GRE Biology: DNA Replication
- GRE Biology: Genetic Mutations
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- GRE Biology: Introduction to Viruses
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- GRE Biology: Male Reproductive Structures
- GRE Biology: Female Reproductive Structures
- GRE Biology: Animal Reproduction & Development
- GRE Biology: Plant Structure, Function, and Organization
- GRE Biology: Plant Reproduction, Growth, and Development
- GRE Biology: Ecological Interactions
- GRE Biology: Ecological Chemical Cycling
- GRE Biology: The Diversity of Life
- GRE Biology: Behavioral Ecology
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