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Grade 9 · Science · Unit 2 of 13

Ecosystems in Balance

Food webs, energy flow, cycles and human impact.

What your child practises

Practises ecosystems: food chains and webs, energy flow, population limits, cycles and how people affect and can restore them, with examples from New Brunswick. It follows the Grade 9 science skill descriptors on ecosystems in the New Brunswick curriculum.

New Brunswick Curriculum skill descriptor: Scientific Literacy: Sensemaking, Learning and Living Sustainably: Responsible and Sustainable Application · explanations about ecosystems and responsible, sustainable actions

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which statement about energy in a food chain is true?

    • about 10% passes from one level to the next
    • no energy passes
    • all energy is gained
    • 100% passes

  2. Question 2

    What is a limiting factor?

    • something that limits how many organisms can live in an ecosystem
    • a map
    • a fence
    • a rule

  3. Question 3

    What is succession?

    • a food chain
    • gradual change in the species in an area over time
    • a sudden flood
    • the end of a season

  4. Question 4

    Which of these is a biotic (living) factor?

    • water
    • sunlight
    • temperature
    • a tree

  5. Question 5

    What are consumers?

    • rocks
    • organisms that eat other organisms
    • water
    • plants that make food

  6. Question 6

    How do beavers change ecosystems?

    • they destroy rivers forever
    • they have no effect
    • their dams create ponds and wetlands
    • they remove all trees

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