Mid-Unit Ecology Test

In grade 7 science, we have made it to the halfway point in our unit on Interactions within Ecosystems. Students will be writing a test on Tuesday, October 23. Although it is still over a week away, I want to give plenty of warning ahead of time so that students can be adequately prepared.

Last week, students completed an online practice quiz on many of the topics. If students want to complete this online practice again they can do so by clicking HERE (game code is 516823).

Next Tuesday, students will be writing a mock test (which I will mark and get back to them the following class) so they can see what a science test looks like and get a sense of what they know (and what they don’t know) heading into the next weekend. Friday (7-09)/Monday (7-10) in class, we will be also be completing an additional review but there is still lots of studying that the students can be doing at their homes in preparation for this test.

There are several terms to know for this test. Students should be able to identify and explain each term listed below. Students have been adding notes into their science notebooks which include much of the required information (they can use these notebooks on the test too!) but I also want to direct students to the following text and online links that will be helpful in review:

Here is a rundown of the test and the concepts that students should know before writing:


Part A (Knowledge and Understanding)

  • True or False (7 questions)
  • Multiple Choice (8 questions)
  • Matching (5 questions)

Part B (Communication)

  • Paragraph answers (3 questions)

Part C (Making Connections/Applications)

  • Determining population amount (1 question)
  • Graphical analysis (1 question)


1) Identifying abiotic and biotic factors in an ecosystem

  • Terminology: biology, ecology, ecosystem, abiotic, biotic
  • Concept: Identify items as abiotic or biotic and justify the choice
  • Example Question: Give two examples of biotic factors and two examples of abiotic factors seen in the picture. Explain your choices.

2) Organization of living things

  • Terminology: organism, species, population, community, ecosystem, habitat
  • Concept: Know how an ecosystem is organized


  • Example Question: Explain why a pond could be considered an ecosystem. List some of the different populations found at the pond.

3) Limiting factors in ecosystems

  • Terminology: Immigration, Emigration, Predator, Prey, Competition, Mutualism, Carrying Capacity, Limiting Factor
  • Concept: Calculating population rate
  • Concept: Identify, list and explain several different abiotic (e.g. amount of sunlight) and biotic (e.g. competition) factors that limit the growth of a population
  • Example Question: The amount of rabbits (prey) in an area increases. What do you think will happen to the population of foxes (predator) in the same area? Explain.
  • Example Question: The population of mice in a barn is 40. Over the winter 3 mice immigrate, 4 die, 3 are born, and 1 emigrate, what is the new population?
  • Example Question: Choose which graph best represents each scenario… explain your choices.
    • Scenario 1 = There were 3 cold springs in a row
    • Scenario 2 = There were 3 hot summers in a row


Students will have the entire 50-minute block to write the test and can use their science notebooks while writing.

Looking for more clarification? Check out the Ecosystems page on the blog.


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