Ch 7: ILTS Environmental Science: Organisms in the Environment

About This Chapter

Let us teach you about organisms in the environment. The video lessons and self-assessment quizzes in this chapter can prepare you to answer questions about life science on the ILTS Science: Environmental Science content area test.

ILTS Science: Environmental Science - Organisms in the Environment: Chapter Summary

Explore various biomes, including coral reefs, deserts, taigas and tundras, through this chapter on organisms in the environment. This group of online video lessons can help you refresh your knowledge before taking the Illinois Licensure Testing System (ILTS) Science: Environmental Science test. In addition to examining numerous types of biomes, this chapter delves into conservation biology, habitat fragmentation and metapopulations. It also covers the following environmental science topics:

  • Ecosystems, habitats and ecological niches
  • Ecological succession: from pioneer to climax communities
  • Populations: density, survivorship and life histories
  • Dispersal, colonization and island biogeography
  • Symbiotic relationships
  • Carrying capacity, migration and dispersion
  • Interspecific competition, competitive exclusion and niche differentiation
  • Food chains, trophic levels and energy flow in an ecosystem
  • Predator/prey interactions, camouflage, mimicry and warning coloration
  • Instruments and technologies used at the organism and ecosystem levels

ILTS Science: Environmental Science - Organisms in the Environment Objectives

If you're an aspiring environmental science teacher in Illinois, you'll need to pass the ILTS Science: Environmental Science content area test to earn certification as a public school teacher. This test features 125 multiple-choice questions covering six subareas: science and technology, life science, physical science, earth systems and the universe, the physical and living environment, and environmental issues. Questions about organisms in the environment are likely to be included in the life science subarea.

To help you review for the ILTS Science: Environmental Science exam, we have assembled this series of brief video lessons. Each lesson is taught by an experienced professional educator and accompanied by a self-assessment quiz so you can measure your knowledge of organisms in the environment. The quizzes also can help familiarize you with the format of the ILTS so you're not surprised on test day.

13 Lessons in Chapter 7: ILTS Environmental Science: Organisms in the Environment
Test your knowledge with a 30-question chapter practice test
Biomes: Tundra, Taiga, Temperate Grassland, and Coastlines

1. 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.

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

2. 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.

Ecosystems, Habitats and Ecological Niches

3. 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.

Conservation Biology, Habitat Fragmentation, and Metapopulations

4. Conservation Biology, Habitat Fragmentation, and Metapopulations

It's becoming harder to conserve large, unbroken tracts of wilderness. Is there another way for conservation biologists to ensure the survival of a species? In this lesson, you'll learn about habitat fragmentation and metapopulations.

Ecological Succession: From Pioneer to Climax Communities

5. 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.

Populations: Density, Survivorship and Life Histories

6. 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.

Dispersal, Colonization, and Island Biogeography

7. 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.

Symbiotic Relationships: Mutualism, Commensalism & Parasitism

8. 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.

Carrying Capacity, Migration & Dispersion

9. 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.

Interspecific Competition, Competitive Exclusion & Niche Differentiation

10. 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.

Food Chains, Trophic Levels and Energy Flow in an Ecosystem

11. 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.

The Environment, Levels of Ecology and Ecosystems

12. 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.

Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

13. 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.

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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