Investigating an Ecosystem

  1. The ______ is the name given to the parts of the earth which contain living organisms.
  2. The study of the biosphere is called ______
  3. The earth is a biosphere which can be divided up into ____ ________.
    many ecosystems
  4. An ecosystem is made up of ______ and ______ and the place where they live.
    animals and plants
  5. The place where an organism lives is known as its ______
  6. Examples of ecosystems are:
    a forest, a pond, the sea
  7. In order to study an ecosystem it is often important to find out about the ______ and _____ of organisms found there.
    • number
    • types
  8. because it is usually very difficult to count all the organisms present, ________ _______ are used so that the number and types of organisms present can be estimated
    sampling techniques
  9. Sampling techniques include:
    quadrats, and pitfall traps
  10. A ______ is a square-shaped frame of known area which is usually divided into smaller squares
  11. A ______ can be used to estimate the number of plants in an ecosystem
  12. For reliable results from a quadrat: (4points)
    • should be thrown several times,
    • should be thrown at random,
    • area should be known
    • size of the area being investigated should be known
  13. A quadrat can also be used to measure the ________ of different plants in an area. This allows us to compare the amounts of different plants present.
  14. A ______ ____ is a method of sampling the animals present on the floor of a forest or wood.
    pitfall trap
  15. For best results using a pitfall trap:
    • set up several traps
    • check traps regularly
    • cover the top of the trap
  16. Once organisms have been collected they can be identified by using ________ ___
    biological keys
  17. There are two types of key:
    • a branched key
    • a paired statement key
  18. There are many factors in an ecosystem that can affect the _________ of organisms
  19. Aboitic factors include:
    • light intensity
    • moisture
    • temperature
    • pH
  20. Light intensity and moisture content can be measured easily using a __________. This meter contains a light sensor and a moisture probe & two scales:
    light intensity uses scale
    moisture meter uses scale
    • light/ moisture meter
    • A-H
    • 1-10
  21. Ways to minimise errors when using the moisture probe:
    1)moisture probe may still contain moisture from previous reading.
    2)moisture probe may hit a stone.
    • dry the probe thoroughly before each reading.
    • remove the probe and enter close to the previous point.
  22. Ways to minimise errors when using the light sensor:
    1)shadows between the light source and light meter
    2)light intensity is different at different times of the day
    • ensure there is no shadows covering the light meter
    • take light readings at the same time of day
Card Set
Investigating an Ecosystem
Biology, The Biosphere, Subtopic