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Unit C

Unit C. Chapter 1 Ecosystems-Characteristics and Cycles. Vocabulary. Environment: Biotic: Abiotic: Habitat: Population: Community: Ecosystem: Niche Water cycle: Transpiration: Evaporation: Condensation: Precipitation: Groundwater: Carbon dioxide-oxygen cycle: Nitrogen cycle:

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Unit C

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  1. Unit C Chapter 1Ecosystems-Characteristics and Cycles

  2. Vocabulary • Environment: • Biotic: • Abiotic: • Habitat: • Population: • Community: • Ecosystem: • Niche • Water cycle: • Transpiration: • Evaporation: • Condensation: • Precipitation: • Groundwater: • Carbon dioxide-oxygen cycle: • Nitrogen cycle: • Reusable resources: • Renewable resources: • Nonrenewable resources:

  3. Lesson 1: What Are the Characteristics of an Ecosystem Objectives: • You will learn how living and nonliving things interact in an ecosystem. • You will learn how different factors affect an ecosystem.

  4. Life on Earth An organism’s environment includes both living and non-living parts. • What is an environment? • An environment is the surroundings in which an organism lives. • Why do different species of plants and animals live in different environments? • Organism’s have different needs that must be met by different environments.

  5. Name some biotic parts of an environment. • Plants- • Animals- • What are some abiotic factors that affect an environment? • Land • Air • Water • Minerals • Climate • Is every part of an ecosystem living? Explain. • No; an ecosystem is made up of a biotic community and its abiotic surroundings.

  6. How Abiotic Factors Affect Ecosystems Abiotic factors determine the plants and animals that live in an ecosystem. • What happens when two populations of organism have the same niche in the same ecosystem? • The compete for the same limited resources; one population may be pushed out. • What are some of the abiotic factors that influence the kinds and numbers of plants that can grow in an area? • Rainfall *Light *Air • Temperature *Climate *Moisture in the Air

  7. How do abiotic factors affect plant growth in the Arctic tundra? • The cold, dry climate and short growing season limit plants to those that can grow fast and absorb moisture quickly. • How can several populations share a habitat? • Each occupies a different niche, so they do not compete for the same resources.

  8. Visual Learning Study the photographs in Habitats and Niches and read the captions on pages C8-C9. • What are the climate conditions in this habitat? • It is damp and shady. • All three animal populations live in the same rotting log. How are their niches similar? • The niches are in the same habitat. • How are they different? • They satisfy different food requirements for each population.

  9. 4. Do the moss and mushrooms compete for nutrients in the wood? • No, moss produces its own food; mushrooms absorb nutrients form decaying wood.

  10. How Biotic Factors Affect Ecosystems • What kind of plants are the first to grow after a natural disaster? • Small, weedy, fast growing plants that release seeds in one season. • How does the fir tree affect the goshawk? • Larvae of a moth eat the fir, songbirds eat the moths, and the goshawk eats the songbirds. Without the tree, the goshawk would not have food.

  11. What is the role of fireweeds? • These plants grow quickly in burned areas. When they die and decompose, they enrich the soil so other plants can grow. • How are the roles of the fir tree and the fireweed similar? • They both interact with other organisms to influence their ecosystems.

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