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Grade 9 · Science · Unit 1 of 14

Ecosystems in Balance

Cycles, food webs and succession

What your child practises

How the biosphere, hydrosphere, lithosphere and atmosphere interact, food webs and the 10% energy rule, the carbon, nitrogen, water and phosphorus cycles, succession and biodiversity, how people change ecosystems, and farming practices that protect soil and water.

Prince Edward Island Curriculum curriculum outcome: Biodiversity & Sustainability of Ecosystems · the spheres of Earth, food webs, energy and matter cycles in ecosystems

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

    Why does a higher biodiversity usually make an ecosystem more resilient?

    • It removes the need for producers
    • It means fewer species depend on each other
    • If one species declines, others can fill its role
    • It stops all change

  2. Question 2

    Which statement about matter and energy in an ecosystem is correct?

    • Both are used up completely
    • Matter is recycled, while energy flows through and leaves as heat
    • Energy is recycled, while matter flows through
    • Both cycle forever with no loss

  3. Question 3

    Which sphere includes rock, soil and landforms?

    • biosphere
    • atmosphere
    • lithosphere
    • hydrosphere

  4. Question 4

    Producer, consumer or decomposer? Sort each organism.

    Sort into: 🌱 Producer · 🦌 Consumer · 🍄 Decomposer

    • 🍁sugar maple
    • 🌾cattails
    • 🦆loon
    • 🦌white-tailed deer
    • 🐛earthworms in compost
    • 🦠soil bacteria

  5. Question 5

    What does a producer do in an ecosystem?

    • Eats other animals
    • Breaks down dead matter
    • Only lives in water
    • Makes its own food, usually by photosynthesis

  6. Question 6

    Which sphere of Earth includes all living things?

    • biosphere
    • atmosphere
    • hydrosphere
    • lithosphere

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