Science, 2009
  Grade Level:   4-5  
  EALR 4:   Life Science  
  Big Idea:   Ecosystems (LS2)  
  Core Content:   Food Webs                   
  Description:   In prior grades students learned that ecosystems include both plant and animal populations as well as nonliving resources, and that plants and animals depend on one another and on the nonliving resources in their ecosystem to survive. In grades 4-5 students learn how ecosystems change and how these changes affect the capacity of an ecosystem to support populations. Some changes in ecosystems are caused by the organisms themselves. The ability of any organism to survive will depend on its characteristics and behaviors. Humans also play an important role in many ecosystems and may reduce negative impacts through thoughtful use of natural resources. Concepts related to ecosystems, including food webs, make it possible for students to understand the interrelationships among various forms of life and between living things and their environment.  
  Content Standard:   4-5 LS2D Ecosystems can change slowly or rapidly. Big changes over a short period of time can have a major impact on the ecosystem and the populations of plants and animals living there.  
Students are expected to:
  • Apply knowledge of a plant or animal's relationship to its ecosystem and to other plants and animals to predict whether and how a slow or rapid change in the ecosystem might affect the population of that plant or animal.*a
    Mathematics Connection
  • *a   4.5.J,5.6.J   Make and test conjectures based on data (or information) collected from explorations and experiments.