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6th Grade  Chapter 6

6th Grade Chapter 6






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    6th Grade  Chapter 6 6th Grade Chapter 6 Presentation Transcript

    • Chapter 6 Ecology
    • Ecosystems Section 6-1H.W. pg. 156 ques. 1-4
      • In a forest live many organisms. There might be deer, insects, plants, mushrooms, birds, deer, etc..
      • All of these organisms, along with other nonliving things, like rocks, and water, composed what we call an ecosystem.
      • An ecosystem is made up of organisms interacting with one another and with nonliving factors to form a working unit.
    • Ecosystems
      • An example of when organisms interact with one another would be when a lion hunts down its prey, or when two organisms mate to produce an offspring.
      • An example of when an organism interacts with nonliving things would be when an animal hides beneath a rock for shelter or protection.
    • The Largest Ecosystem
      • Ecosystems come in all sizes. A forest is a large one, and a pile of leaves can be considered a small one.
      • The largest ecosystem is called the biosphere.
      • The biosphere is the part of the Earthwhere organisms can live. It includes the topmost layer of the Earth’s crust, all bodies of water, and the surrounding atmosphere.
      • The biosphere is made up of all of the Earth’s ecosystems combined.
    • Living Parts of an Ecosystems
      • Some examples of ecosystems are deserts, mountains, rivers, prairies, wetlands, forests, plains, oceans, etc….
      • Each ecosystem contains many different living organisms. Take a rotting tree trunk for example.
      • Bacteria, insects, birds, and other animals can all live there at once.
      • The living parts of an ecosystem are called biotic factors and they depend on other biotic factors for food, shelter, and protection.
    • Nonliving parts of an ecosystem
      • Abiotic factors are nonliving factors of an ecosystem. They include the air, water, soil, rocks, etc….
      • These factors affect the type and number of organisms living in a particular environment.
      • We are going to take a look at some important abiotic factors such as; water, soil, temperature, and sunlight.
    • Abiotic Factors
      • Soil- this is an abiotic factor that can affect which plants and organisms are found in an ecosystem.
      • Not all soils are the same. Within soil there are many elements and compounds, as well as minerals and vitamins that plants and other organisms need to survive.
      • Different soils have different amounts of these vitamins and minerals, and compounds. And these different levels are different for each ecosystem.
      • The soil you find in Iowa is not going to be the same as the soil in California.
    • Abiotic Factors
      • Temperature- this also can determine which organisms live in a particular place. Tropical plants will not survive in a dry desert.
      • Water- Water composes most of living things. We are more than 65% water. It also helps out living things carry out many important processes such as digestion and waste removal.
      • Also the amount of water in an ecosystem can determine how many organisms can live in a particular area. It can also serve as shelter and as a way to move from place to place.
    • Abiotic Factors
      • Sunlight- The sun the main source of energy for most organisms on Earth.
      • Sunlight is used by plants to go through photosynthesis and produce food.
      • Humans and other animals obtain their energy by eating the plants, so the energy we get from plants was once sunlight.
    • A Balanced System
      • Every ecosystem is made up of many different factors that work together. When these factors are in balance with one another the whole ecosystem is in balance.
      • Ecosystems are always changing and many events can change the balance of an ecosystem, like a drought.
      • Some organisms like plants or fish would not survive to long without water and might have to find new homes.
    • Relationships Among Living Things Sec. 6-2 H.W. pg 164 ques. 1-4 & pg 172 ques. 1-5
      • We have to know that ecosystems are organized by scientists so that it is easier to study.
      • They study hoe the members of a group interact with each other and their environments.
      • Now lets look at groups of organisms. Take a sea horse for example. They live in coral reefs in warm waters.
      • The coral reefs are the ecosystem that the sea horses live in. And all the seahorses that live in this particular coral reef are considered a population.
      • A population is a group of the same type of organisms living in the same place at the same time.
      • What are some other populations that might live in this coral ecosystem?
    • Groups of Populations
      • Many populations live within an ecosystem, like the coral reef.
      • All of the populations that live in an ecosystem are called a community.
      • So in our coral reef ecosystem the community that might live there are the seahorses, sponges, algae, fish, etc…..
      • The members of a community depend on each other for food, shelter, and some other needs.
    • Population Density
      • In this class there is a population of students and this classroom is a certain size.
      • So if there are 22 students in this class and this room is 100 square feet.
      • This means that the population density is 2.2 students per square foot.