Chapter 21 section 1 pg 705
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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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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?

  • Key terms: organism, habitat, biotic factor, abiotic factor, photosynthesis, species, population, community, ecosystem, ecology


Organisms and habitats

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.


Biotic factors

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.


Abiotic factors

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


Levels of organization

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.


In other words

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.


And finally

And, finally

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


Please complete

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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