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Grade 7 Science. Unit 1: Interactions within Ecosystems. What is an Ecosystem?. Complete the activity on page 5: What is an Ecosystem?. What is an Ecosystem?. What is found in an ecosystem? Animals and Plants An organism is any living thing, such as a plant or animal.

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Grade 7 science

Grade 7 Science

Unit 1: Interactions within Ecosystems

What is an ecosystem
What is an Ecosystem?

Complete the activity on page 5:

What is an Ecosystem?

What is an ecosystem1
What is an Ecosystem?

  • What is found in an ecosystem?

    • Animals and Plants

  • An organism is any living thing, such as a plant or animal.

What is an ecosystem2
What is an Ecosystem?

  • Places where organisms live are called habitats.

  • Everything that is needed for an organism to survive would be found in a habitat.

What is an ecosystem3
What is an Ecosystem?

  • Non-living things that affect organisms are called abiotic factors.

  • What are some examples?

    • Water, rocks, sunlight, and air

What is an ecosystem4
What is an Ecosystem?

  • Living things that are found in an environment are called biotic factors.

  • Organisms are biotic factors.

  • How do animals affect each other?

    • Feed each other

    • Compete with each other

    • Help each other

Activity abiotic biotic factors
Activity: Abiotic & Biotic Factors

  • Cards placed into correct category

What is an ecosystem5
What is an Ecosystem?

  • An ecosystem is all the living and non living things in a particular place.

  • How large is an ecosystem?

    • Ecosystems can be very large, like the ocean or forest,

    • or they can be very small, like under a log or a nest in a tree.

What is an ecosystem6
What is an Ecosystem?

  • There are four ecosystems in Atlantic Canada:

    • Coastlines and oceans

      • Brown seaweeds, barnacles, mussels, starfish, rock crabs

      • Water currents affect temperatures and climate

      • Larger animals include cod, seals, and whales

      • Salt content affect organisms

      • Deep water prevent sunlight from reaching bottom

What is an ecosystem7
What is an Ecosystem?

  • Freshwater: Rivers, Lakes and Ponds

    • Fish such as whitefish and sticklebacks

    • Beavers, muskrats, ducks, and geese

    • Frogs, insects, snails

    • Water plants

    • Rain and snow supply water

What is an ecosystem8
What is an Ecosystem?

  • Arctic

    • Northern Labrador

    • Very low temperatures and little precipitation

    • Permafrost: soil is always frozen one metre below the surface

    • Low shrubs, mosses, lichens and small flowers

    • Caribou, musk ox, wolves, arctic foxes, arctic hares, lemmings

    • Birds during spring and summer

What is an ecosystem9
What is an Ecosystem?

  • Forests

    • Much of Newfoundland and Labrador

    • Summers cool and winters wet

    • Balsam fir, white birch, black spruce, mountain ash

    • Moose, caribou, black bear, lynx, red fox, pine marten, mink

    • Sometimes bogs and marshes

    • Peat (buildup of decaying plant matter)

Activity foldable
Activity: Foldable

  • Create a foldable showcasing the ecosystems found in Newfoundland.

What is an ecosystem10
What is an Ecosystem?

  • Most plants and animals have a range of tolerance.

  • Range of Tolerance is the range of conditions within which an organism can live.

    • Ex: heat, light, water, etc.

  • Range of tolerance is the factor that determines where organisms live.

What is an ecosystem11
What is an Ecosystem?

  • Abiotic Factors:

    • 1. Light and light intensity

      • All plants need light to survive.

      • Some plants need more light than others.

      • Animals can survive in dark and light areas.

What is an ecosystem12
What is an Ecosystem?

  • 2. Temperature

    • All animals and plants have a certain temperature that they need to survive.

What is an ecosystem13
What is an Ecosystem?

  • 3. Soil

    • Plants get nutrients from the soil.

    • Plants grow roots into soil.

    • Animals form tunnels for air and water to move through.

What is an ecosystem14
What is an Ecosystem?

  • 4. Air and Wind

    • Windy areas can affect plant growth since these areas tend to be dry.

    • Plants usually grow shorter than normal.

    • Animals that fly can also be affected by the wind.

What is an ecosystem15
What is an Ecosystem?

  • 5. Water

    • All organisms need water to survive.

    • Some organisms can survive with smaller amounts of water.

What is an ecosystem16
What is an Ecosystem?

  • What are biotic factors?

  • Ecologists study ecosystems by first studying a species.

  • A species is a group of organisms that can reproduce to produce similar, fertile organisms.

What is an ecosystem17
What is an Ecosystem?

  • When only one organism is studied, that is an individual.

  • When many organisms of the same species live in the same ecosystem, they make a population.

  • A group of populations which interact and share a common ecosystem form a community.

  • What populations are there in Clarenville?

Habitat versus niche
Habitat versus Niche

  • Habitat: the organism’s address; where does it live?

  • Ex. A moose’s habitat is the boreal forest.


  • Niche: the organism’s job; what role does the organism play in its environment. It includes:

    • where it lives

    • how it obtains food

    • how it affects its environment


  • Ex. A moose lives in the boreal forest, it is a herbivore (plant eater), it provides a home for parasites and it provides food for coyotes.

Activity think about it seabirds p 26
ActivityThink About It... Seabirds! p. 26

  • Complete the dichotomous key