Fremont Magnet Elementary

Back to 4th Grade Science

Ecosystems

Standard 3a Students know ecosystems can be characterized by their living and nonliving components.  

1. Review

Last week you learned how decomposers break down dead material, and you learned that most bacteria is helpful. 

 

Which of the following is an example of a helpful effect of a microorganism.

  fermenting of yogurt
  evaporating water
 
falling acorns

Which of the following is a characteristic of most bacteria?
 

  cause some plants to make nitrogen
 
live off already dead tissue
 
damage or kill living body cells

 

 

2. What is a biome?

A biome is a large geographical area with a certain climate.  For example, a desert biome has very little rain.  The plants and animals that are able to live in that place with its particular climate have adapted in different ways to the amounts of water, heat, and soil in that area.

Click here to see some biomes

World Biomes

3. What is an ecosystem?

There can be lots of ecosystems in a biome.  An ecosystem is all the living and nonliving things in a certain area and how they interact.

  • Nonliving things are rocks and soil.

  • Living things are animals and plants.

 

Click here to see a BrainPop movie about ecosystems 

Which of the following makes up an ecosystem?

  All the living things on Earth
  The living and nonliving things in a particular place
 
The living things found in a particular place

4. What is a habitat?

Each living organism has its own habitat. A habitat supplies it with everything it needs to survive - food, water, and a home. The habitat is part of the ecosystem.

 

Here is one way to think about all these words.

  • A biome is like the town where an animal lives

  • An ecosystem is like the neighborhood

  • A habitat is like its house

4. Can animals and plants survive anywhere?

Since plants and animals depend on each other, it is important their environment has the right kind of animals and plants.  If you put a desert tortoise in the arctic it wouldn't survive.  It wouldn't have the right food and climate to live.  Each ecosystem has its own special plants and animals.  They live there because it has the right conditions for them to thrive.

 

Here's a game where you try to grow into a bigger fish without getting eaten.

BBC Habitates

Biomes of the World

BrainPop Jr. Desert Habitat

Animal Activities

Biomes

Magic Schoolbus Habitat Match Up

Introduction to Biomes