6th Grade Chapter 6

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6th Grade Chapter 6

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

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