About This Chapter
PSSA Science Grade 8: Ecological Systems- Chapter Summary
Before your students take the PSSA Science Grade 8 Science Exam, you should make sure that they have a thorough understanding of the subject of ecological systems. This subject is covered extensively in the lessons contained within this chapter. The lessons will review topics such as:
- Producers, consumers and decomposers
- The definition, factors and examples of biotic and abiotic systems
- Types of community ecology
- Predator/prey interactions
- Symbiotic relationships
- Ecological succession
Additionally, you can test your students' understanding of these topics, and more, by having them take the practice quizzes also included in this chapter. Overall, our study resources will provide your students with comprehensive overviews of everything they need to know to do well on the PSSA Science Grade 8 exam itself!
1. Producers, Consumers & Decomposers in Ecosystems
In this lesson we will learn about producers, consumers, and decomposers. Find out what they are and how they interact with one another in the ecosystem.
2. What is Biotic? - Definition, Factors & Examples
In this lesson you will learn about the biotic components in an ecosystem and the biotic factors that affect organisms. You will also have a better understanding about why planet Earth is a pretty special place.
3. 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.
4. Community Ecology: Definition & Types
Community ecology looks at the interactions between populations of organisms. Here we explore a polar ecosystem in Greenland to describe what community ecology entails and what it really means to be at the top of the food chain.
5. 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.
6. 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.
7. Interspecific Competition, Competitive Exclusion & Niche Differentiation
What happens when two similar species that consume the same resources occupy the same space? Interspecific competition, that's what! Watch our video lesson to learn about the outcomes of this ecological battle.
8. 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.
9. 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.
10. Populations: Density, Survivorship and Life Histories
Have you ever wondered how biologists determine the populations of animals in a particular geographic area? Watch this video lesson to find out, and discover how scientists look at the survivorship and life histories of many different species.
11. Dispersal, Colonization, and Island Biogeography
Have you ever gone in your backyard and discovered a wild raspberry bush that has never been there before? How did it get there? Why is there only one bush year after year? In this lesson, you'll study how plant and animal species colonize in new areas through dispersal and immigration and how some species thrive in a new area while others fail.
12. 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.
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Other chapters within the PSSA - Science Grade 8: Test Prep & Practice course
- PSSA - Science Grade 8: Research & Experiments
- PSSA - Science Grade 8: Scientific Inquiry
- PSSA - Science Grade 8: Environmental Issues
- PSSA - Science Grade 8: History, Nature & Relationships of Science
- PSSA - Science Grade 8: Interpreting Data
- PSSA - Science Grade 8: Evaluating Change in a System
- PSSA - Science Grade 8: Scientific Instruments
- PSSA - Science Grade 8: Systems, Models & Patterns
- PSSA - Science Grade 8: Structure & Function of Living Things
- PSSA - Science Grade 8: Organism Characteristics & Biological Evolution
- PSSA - Science Grade 8: Natural Selection & Evolution
- PSSA - Science Grade 8: Genetics & Inherited Traits
- PSSA - Science Grade 8: Biomes
- PSSA - Science Grade 8: Human Impact on the Environment
- PSSA - Science Grade 8: Renewable & Non-Renewable Resources
- PSSA - Science Grade 8: Solutions & Elements
- PSSA - Science Grade 8: Matter
- Overview of Stoichiometry
- Types of Reactions in Chemistry
- PSSA - Science Grade 8: Earth's Energy Resources
- PSSA - Science Grade 8: Transfer & Conversion of Energy
- PSSA - Science Grade 8: Solar Radiation & Energy
- PSSA - Science Grade 8: Motion
- PSSA - Science Grade 8: Force
- PSSA - Science Grade 8: Analyzing Forces & Motion
- PSSA - Science Grade 8: Earthquakes, Rocks & Earth
- PSSA - Science Grade 8: Weathering & Erosion
- PSSA - Science Grade 8: The Water Cycle
- PSSA - Science Grade 8: Water Systems on Earth
- Ground Water Systems
- Running Bodies of Water
- Weather Events
- Geomorphology of Arid Regions
- PSSA - Science Grade 8: Atmospheric, Weather & Wind Patterns
- Global Temperature Patterns & The Atmosphere
- PSSA - Science Grade 8: Climate & Climate Change
- Atmospheric Pressure and Wind
- PSSA - Science Grade 8: Clouds
- PSSA - Science Grade 8: Earth, Moon & Sun
- PSSA - Science Grade 8: The Moon
- PSSA - Science Grade 8: Orbits of Celestial Bodies
- PSSA - Science Grade 8 Flashcards