About This Chapter
TExES Science 7-12: Ecosystems and Ecological Cycles - Chapter Summary
Study this chapter's video lessons on ecosystems and ecological cycles in anticipation of taking the TExES Science 7-12 exam. The lessons consist of facts you've probably learned previously, although some information may be new to you. In part, you'll learn about habitat destruction, aquatic biomes and the metapopulation theory. Other lesson topics include:
- Ecology levels, ecological niches, food chains, habitats and energy flow
- Interspecific competition, camouflage and symbiotic relationships
- Population density and carrying capacity
- Biodiversity, deforestation and ecological conservation
- Ecological succession and invasive species
- The biomes of the Earth
- Biogeochemical cycling and the cycles of matter
- Non-renewable and renewable resources
- Global warming and fossil fuels
Lesson instructors are experts on the subject matter, and they're available to help you if you need assistance with the concepts that are presented. You can spend as much time reviewing the lessons as you want; they're conveniently self-paced. Watch the video lessons online with your mobile technology, read through the written transcripts or print out the accompanying worksheets and study them offline at any point during your day.
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. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. Carrying Capacity, Migration & Dispersion
Have you ever wondered why some types of birds fly south in the winter or why some animals form territories? Watch this video to learn about a species' maximum growth capabilities, the way its members group themselves and why they might migrate to new locations every year.
9. 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.
10. Deforestation, Desertification & Declining Biological Diversity
When trees are lost due to deforestation, the result can be a drier climate and desertification or the transformation of the once fertile land to desert. Learn how deforestation and desertification can lead to a decline in biological diversity.
11. Human Environmental Impact & Ecological Conservation
The Earth has only so much space for us and our non-human neighbors. In this lesson, we will learn about how humans impact the environment, what causes habitat fragmentation, and what ecological conservation can do to help.
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.
13. 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?
14. Overview of the Earth's Biomes
Biomes are defined both climatically and geographically as areas with similar factors, such as plants and animals, soil quality, and growing seasons. In this lesson, we'll learn about the five major categories of the Earth's biomes.
15. 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.
16. Cycles of Matter: The Nitrogen Cycle and the Carbon Cycle
Matter is constantly cycled between living and nonliving parts of the environment. Processes like photosynthesis and nitrogen fixation allow the carbon and nitrogen cycles to regenerate needed substances by recycling Earth's atoms.
17. Renewable & Non-Renewable Resources: Definition & Differences
We use a variety of Earth's resources, but not all of them will be around forever. This lesson explains the difference between resources that can be regenerated for our use and those that are gone after they are used once.
18. 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.
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Other chapters within the TExES Science 7-12 (236): Practice & Study Guide course
- About the TExES Science 7-12 Exam
- TExES Science 7-12: Scientific Inquiry & Processes
- TExES Science 7-12: Motion
- TExES Science 7-12: Fluid Mechanics
- TExES Science 7-12: Newton's Laws
- TExES Science 7-12: Oscillations
- TExES Science 7-12: Laws of Gravitation
- TExES Science 7-12: Electrical Forces & Fields
- TExES Science 7-12: Electricity & Magnetism
- TExES Science 7-12: Potential & Capacitance
- TExES Science 7-12: Work, Energy & Power
- TExES Science 7-12: Linear & Angular Momentum
- TExES Science 7-12: Thermodynamics
- TExES Science 7-12: Optics & Waves
- TExES Science 7-12: Quantum Physics
- TExES Science 7-12: Matter & Atomic Structure
- TExES Science 7-12: Periodicity
- TExES Science 7-12: Properties of Gases
- TExES Science 7-12: Chemical Bonding
- TExES Science 7-12: Chemical Equations & Stoichiometry
- TExES Science 7-12: Equilibrium
- TExES Science 7-12: Properties of Solutions
- TExES Science 7-12: Energy Transformations
- TExES Science 7-12: Radioactivity
- TExES Science 7-12: Oxidation-Reduction Reactions
- TExES Science 7-12: Acid-Base Chemistry
- TExES Science 7-12: Organic Compounds
- TExES Science 7-12: Cell Biology
- TExES Science 7-12: Prokaryotic & Eukaryotic Cells
- TExES Science 7-12: Protists, Fungi & Viruses
- TExES Science 7-12: Plant Cells
- TExES Science 7-12: Nucleic Acids & Enzymes
- TExES Science 7-12: Transcription & Translation
- TExES Science 7-12: Cell Reproduction & Division
- TExES Science 7-12: Metabolic Biochemistry
- TExES Science 7-12: Basic Genetics
- TExES Science 7-12: DNA Replication
- TExES Science 7-12: Theory of Biological Evolution
- TExES Science 7-12: Evolutionary Change on Earth
- TExES Science 7-12: Taxonomic Systems
- TExES Science 7-12: Plant Biology
- TExES Science 7-12: Plant Reproduction & Growth
- TExES Science 7-12: Animal Biology
- TExES Science 7-12: Human Organ Systems
- TExES Science 7-12: Human Reproduction & Development
- TExES Science 7-12: Homeostasis of Organisms
- TExES Science 7-12: Biology & Behavior
- TExES Science 7-12: Earth's Spheres & Internal Structure
- TExES Science 7-12: Minerals & Rocks
- TExES Science 7-12: Earth's Changing Surfaces
- TExES Science 7-12: Geologic Time
- TExES Science 7-12: The Hydrosphere
- TExES Science 7-12: Solar System & the Universe
- TExES Science 7-12: The Atmosphere
- TExES Science 7-12: Weather & Storms
- TExES Science 7-12: Learning & Instruction
- TExES Science 7-12 Flashcards