Interactions of Life-Communities

Interactions of Life-Communities - Ch. 24 Interactions of...

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Ch. 24 – Interactions of Life Ch. 24 – Interactions of Life Sec. 3 – Interactions within Communities Sec. 3 – Interactions within Communities 7 th th Grade Science Grade Science Saint Saint
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Objectives Describe how organisms obtain energy for life. Explain how organisms interact. Recognize that every organism occupies a niche.
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Energy Living organisms need a constant supply of energy .
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Energy All of Earth’s energy comes from the Sun .
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Photosynthesis Some organisms use the Sun’s energy to create energy rich molecules through a process called photosynthesis .
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Product of Photosynthesis Energy rich molecules, usually sugars , serve as food . They are made up of oxygen , hydrogen , and carbon atoms. Energy is stored in the chemical bonds of the atoms. When the bond is broken , energy is released to fuel life processes.
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Photosynthesis
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Producers A producer is an organism that uses an outside energy source like the Sun to make energy-rich molecules.
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Producers contain chlorophyll Most producers contain chlorophyll , a chemical that is required for photosynthesis .
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Green Plants Green plants are producers
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Chemosynthesis Some producers make energy-rich molecules through a process called chemosynthesis . These organisms are found near volcanic vents in the ocean floor. Inorganic molecules in the water provide the energy source for chemosynthesis .
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Hydrothermal Vents
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Tubeworms
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Consumer A consumer is an organism that cannot make their own energy-rich molecules. Consumers obtain energy by eating other organisms. Wolves can’t make their own food. They are consumers. The Cape Buffalo can’t make its own food. It is a consumer.
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Producer or Consumer? Tree Dandelion Weasel Walrus Diatom Algae Bacteria Dog You Rhinoceros
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Consumers There are 4 general types of consumers : Herbivores Carnivores Omnivores Decomposers
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Herbivores Herbivores – Plant eaters Deer Rabbits Grasshoppers
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Herbivores Zebras eat grass. They are herbivores. Cows are herbivores.
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Herbivores Hippos are herbivores. Rhinos are herbivores.
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Carnivores Carnivores – Meat Eaters – Eat other animals Frogs Spiders Cougars
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Lions definitely eat meat! Not all carnivores
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This note was uploaded on 11/23/2011 for the course BIO 100 taught by Professor Robinson during the Fall '08 term at BYU.

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Interactions of Life-Communities - Ch. 24 Interactions of...

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