Ecosystems
3rd Grade Science · 7 lessons
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Lessons
- 1How Pollination WorksPollination happens when pollen moves from one flower to another, often carried by bees, butterflies, or wind. This process allows plants to produce seeds and fruit.Experiment
- 2Food Webs and Feeding RelationshipsFood webs show the complex feeding relationships in an ecosystem. Unlike a simple food chain, a food web shows that most organisms eat more than one type of food.Lesson
- 3The Role of DecomposersDecomposers like fungi and bacteria break down dead organisms and return nutrients to the soil. Without decomposers, dead material would pile up and nutrients would be locked away.Lesson
- 4Why Animals MigrateMany animals migrate to find food, warmer weather, or safe places to have their young. Birds, whales, and monarch butterflies are famous for their long migration journeys.Lesson
- 5Predator and Prey BalancePredator-prey relationships help keep ecosystems balanced. When prey populations increase, predator populations grow too. When predators reduce prey numbers, predator populations then decline.Lesson
- 6What Makes an EcosystemEcosystems include all the living and nonliving things in an area that interact with each other. A pond ecosystem includes fish, frogs, algae, water, rocks, and sunlight.Lesson
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