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Chapter 21: Section 1, pg 705

Chapter 21: Section 1, pg 705. Key concepts: What needs are met by an organism’s environment? What are the two parts of an organism’s habitat with which it interacts? What are the levels of organization within an ecosystem?

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Chapter 21: Section 1, pg 705

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  1. Chapter 21: Section 1, pg 705 • Key concepts: What needs are met by an organism’s environment? • What are the two parts of an organism’s habitat with which it interacts? What are the levels of organization within an ecosystem? • Key terms: organism, habitat, biotic factor, abiotic factor, photosynthesis, species, population, community, ecosystem, ecology

  2. Organisms and habitats • An organism is a living thing. • Organisms need to obtain food, water, shelter to live • Habitats are environments that provide areas for organisms to grow and live. • Organisms live in different habitats because they have different requirements for survival.

  3. Biotic factors • An organism interacts with both living and nonliving parts of its habitat. • Biotic factors are the living parts, like animals, plants, and insects.

  4. Abiotic factors • Are the nonliving parts of a habitat. Water, sunlight, oxygen, temperature, and soil. • Water – all living things need water. • Sunlight – needed for photosynthesis (plants make their own food in chloroplasts) which fuels plants to grow. Animals then eat the plants. • Oxygen – most living things require oxygen • Temperature – temperatures determine what kind of organisms live there • Soil – mixture of rocks, nutrients, air, water, and decaying remains of organisms

  5. Levels of organization • Species – group of organisms similar enough to mate and have offspring that can also reproduce • Population – all the members of one species in a particular area • Communities – all the different populations that live together in an area • Ecosystems – the community of organisms that live in a particular area, along with their nonliving surroundings.

  6. In other words: • The smallest level of organization is a single organism, which belongs to a population that includes other members of its species. The population belongs to a community of different species. The community and abiotic factors form an ecosystem.

  7. And, finally • Ecology – the study of how living things interact with each other and with their environments.

  8. Please complete: • Section 1 assessment in your notes, 1abc, 2abc, 3abc • I will check it at the start of our next science period.

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