Interactions & Ecosystems

Learn the roles organisms play within an ecosystem.

9 questions, free, marked as you go with a worked explanation on every one.

What this covers

The questions

  1. An organism that makes its own food using sunlight is called a:
  2. An organism that breaks down dead plants and animals is called a:
  3. A relationship where one organism hunts another for food is called:
  4. The place where an organism lives is called its:
  5. All the living and non-living things in an area make up a(n):
  6. To estimate how many dandelions are growing in a field, a student marks out a 10 m by 10 m sample square and carefully counts 24 dandelions inside it. The whole field has an area of 3 000 square metres. Based on the sample, about how many dandelions are in the field?
  7. A class studies a pond behind the school. Which of these are abiotic (non-living) parts of that pond ecosystem? Select all that apply.
  8. Biologists testing an Alberta lake find that the small minnows carry a mercury concentration of 0.04 ppm in their tissue. The northern pike that feed on those minnows are found to carry 12 times that concentration. What is the mercury concentration in the pike, in ppm?
  9. The table shows how much energy is available at each level of a forest food chain. Use the table. Roughly what fraction of one level's energy passes up to the next level?

Answer these free