Study

Science Unit 1.5-1.8

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  • Why do animals migrate?
    To meet their needs.
  • If the number of predators is decreased, what happens to the population of prey animals?
    The number of prey can increase too much
  • If animals cannot adapt to their changing ecosystem, what may happen to them?
    They may not survive.
  • Three natural changes to an ecosystem are:
    Hurricane, Floods Drought (also fire, landslides, tsunami)
  • What happens to matter in an ecosystem?
    It cycles between parts of the ecosystem.
  • What happens to gases in an ecosystem?
    They are recycled.
  • Slow changes that take place in an ecosystem after a disturbance.
    Succession
  • Does an eagle hold more or less energy than a field mouse?
    A lot less energy
  • Anything humans add to the environment that hurts living things is called
    pollution
  • An animal that captures and eats other animals
    Predator
  • Why do animals hibernate?
    Because they cannot find food in the colder weather.
  • A model that shows the amount of energy that is passed at each level is____?
    An Energy Pyramid
  • What do all food chains have in common?
    They all begin with a producer.
  • Why is the base of the energy pyramid larger than the top?
    Energy is lost as heat at each level, so less energy is available at the top.
  • Living things obtain matter from their environment and release___ back into the environment?
    waste
  • What kind of ecosystem allows many species of organisms to meet their needs?
    A healthy ecosystem
  • If there are not enough prey, what happens to the predators?
    They may starve
  • A field mouse that eats grass is call a ____?
    first level consumer
  • In order for an ecosystem to be healthy, what must exist between predators and prey?
    Balance
  • An animal that is captured and eaten
    Prey
  • An event that changes an ecosystem for a long period of time.
    Disturbance
  • Since humans can eat food from many ecosystems, they are ____?
    part of many food webs.
  • Two ways humans change ecosystems are:
    1. Deforestation (cutting down trees) 2. Building Dams
  • How are food webs related to food chains?
    Food webs are overlapping food chains.
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