Food Webs Test (Next Week)

In grade 7 science, we have completed the Interactions within Ecosystems unit. Students will be writing a test on the content of the second half of the unit in the coming week:

  • Wednesday = 7-10
  • Friday = 7-04/7-09

Next week, all classes will complete a series of review questions using a Jeopardy style game but there is still lots of studying that the students should be doing at their homes over the weekend in preparation for this test.

Like the previous mid-unit test, there are several terms students should be aware of and  should be able to identify and explain each term. Students have been making science notebooks including much of this information (I am hoping that they will be using these while studying) which they are encouraged to bring home and review. The following text pages and links will also be extremely helpful to reinforce the concepts from class:

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

TEST COMPOSITION

Part A (Knowledge and Understanding)

  • Multiple Choice (14 questions)
  • Matching (9 questions)

Part B (Communication)

  • Paragraph answers (3 questions) – students will have the choice to write their answer or record themselves stating their answer orally

Part C (Making Connections/Applications)

  • Food web analysis (4 question)
  • Graphical analysis (1 question)

CONCEPTS

1) Classifying organisms in a food chain or web

  • Terminology: producer, consumer (primary, secondary, tertiary), decomposer, detritivore, scavenger, carnivore, herbivore, omnivore
  • Example Question: In the food web, identify the secondary consumer and explain your choice.
  • Example Question: Which organisms in the food web can be found in more than one feeding level?

2) Energy transfer in food chains and webs

  • Terminology: food chain, energy pyramid (pyramid of numbers)
  • Example Question: How much energy is passed on to the next organism in the food chain? What happens to the other energy?
  • Example Question: If grass creates 2300 kJ of energy, how much energy does the rabbit receive when it eats the grass? Explain.

3) Interactions within food webs

  • Terminology: equilibrium, carrying capacity
  • Example Question: Using the food web, explain three things that would happen if the grasshoppers were removed from the ecosystem.

  • Example Question: Come up with a scenario that could result in the following graph:

graph_foodchains

Students will have the entire 50-minute block to write the test. Those looking for even  more clarification/resources can check out the Ecosystems page on the blog.

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