B. Life Systems · Habitats and Communities

Habitats: Places That Provide the Necessities of Life

B2.1 A1.1 A1.4 A1.5About 40 minutes

Learning goals

I can explain what a habitat is.
I can name the necessities of life: food, water, air, shelter, space, and the right temperature and light.
I can describe how a habitat gives plants and animals what they need.
I can explore a local habitat safely and record what I find.

Words to know

habitat
The place where a plant or animal lives and finds everything it needs to survive.

organism
Any living thing, such as a plant, an animal, a mushroom or a tiny bacterium.

necessities of life
The things every living thing needs to stay alive: food (or nutrients), water, air, shelter, space, and the right temperature and light.

shelter
A safe place that protects an organism from weather and from animals that might eat it.

microhabitat
A very small habitat inside a bigger one, like the damp space under a log.

observe
To look carefully and notice details, using your senses.

Remember from Grades 1 to 3

In Grade 1 you learned that living things have basic needs. In Grade 2 you saw how animals grow and use adaptations to survive. In Grade 3 you learned what plants need: air, water, light, heat, nutrients and space.

Now, in Grade 4, we zoom out. We will look at the places where plants and animals live and how all the living things there work together.

Where does a beaver live?

Picture a beaver. Where does it live? In a pond or a slow stream, in a lodge made of sticks and mud.

Why there? The pond gives the beaver everything it needs:

water to drink and swim in,
food: bark, twigs and leaves from trees near the water, and water plants,
shelter: its lodge, with an underwater door so predators cannot follow,
air to breathe,
space to swim, build and raise its young.

The place where an organism (a living thing) finds everything it needs is called its habitat.

A beaver swims across a calm pond in front of its lodge of sticks and mud, with gnawed tree stumps on the shore. — The pond gives this beaver water, food from the trees along the shore, and shelter in its lodge. Look for the pointed stumps where it chewed down trees. AI-generated image

The necessities of life

Every organism needs the same main things. Scientists call them the necessities of life:

Food (animals eat food; plants make their own food and take nutrients from the soil)
Water
Air (animals need oxygen; plants need carbon dioxide, and oxygen too)
Shelter (a safe place)
Space to move, grow and find food
The right temperature and enough light

A good habitat gives an organism all of these. If even one is missing, the organism must move away or it cannot survive there.

A pond-and-forest habitat gives sunlight, air, water, food, shelter and space.

Big habitats and tiny habitats

A habitat can be huge, like a forest, a lake, a wetland, the Arctic tundra or a grassland. It can also be tiny. The damp, dark space under a log is a microhabitat where worms, beetles and pill bugs live.

Ontario has many kinds of habitats:

forests with maple, oak, pine and spruce trees,
wetlands like marshes, swamps and bogs,
lakes, rivers and ponds,
meadows and fields,
city habitats: parks, backyards, ravines, even the ledges of tall buildings!

Different organisms need different habitats. A fish needs water all the time. A white-tailed deer needs forest edges and fields.

Zoom in on one log in a big forest habitat. The damp, dark space underneath is a microhabitat with its own residents.

Organism	Habitat	Food	Water	Shelter
beaver	pond or stream	bark, twigs, water plants	the pond	lodge of sticks and mud
black bear	forest	berries, nuts, insects, fish	streams and lakes	a den in winter
sugar maple tree	forest	makes its own; nutrients from soil	rain soaked up by its roots	(plants do not need shelter the way animals do)
pill bug	under a log (microhabitat)	rotting leaves and wood	damp soil	the log

How four Ontario organisms get their necessities from their habitats.

Worked example

Let's study a backyard habitat

A robin builds a nest in a maple tree in a backyard. How does the backyard give the robin each necessity of life?

Food: robins pull earthworms from the lawn and eat insects and berries.
Water: puddles, a bird bath, dew and the worms themselves.
Air: all around.
Shelter: the nest, hidden among the leaves of the maple tree.
Space: the yard and nearby yards give room to fly, hunt and raise chicks.
Temperature: spring and summer are warm enough. In fall, many robins fly south, because winter here has less of the food they need.

The backyard provides every necessity in spring and summer, so it is a good habitat for the robin then.

Think like a scientist

When you study a habitat, observe first, then record (draw, list, take photos), then ask questions. A scientist writes down what they really see, not what they expect to see.

Just for fun

A beaver's lodge has an underwater front door. Imagine having to hold your breath every time you came home from school!

Hands-on activity

Local habitat hunt

You need: a notebook, a pencil, a magnifying glass if you have one, a grown-up.

Choose a small area outside: a corner of the yard, a park, or a schoolyard. Mark out about 1 metre by 1 metre with sticks or string.
Observe for 10 minutes. List every living thing you see: plants, insects, spiders, worms, birds overhead.
Gently lift a rock or log, look underneath, then put it back exactly as it was (it is someone's home!).
Make a chart with 3 organisms you found. For each, write how this spot gives it food, water, air, shelter and space.
Share your findings with your family using the words habitat and necessities of life.

Grown-up note (safety): Stay with your child. Avoid poison ivy (leaves in groups of three) and wild parsnip. Do not touch wild animals, droppings, mushrooms or sharp objects. Use sunscreen and check for ticks afterward if you were in long grass or woods. Wash hands when you finish.

Your turn

What is a habitat?

Name the necessities of life.

How does a pond give a frog food?

What is a microhabitat? Give an example.

Why can't a fish live in a meadow?

A plant does not eat food. How does it get what it needs to grow?

When you lift a log to look underneath, why should you put it back carefully?

More practice: warm-up

Is a forest a habitat?

What does a beaver use for shelter?

Name one Ontario habitat that has lots of water.

Is a mushroom an organism?

Which necessity of life do we get by breathing?

More practice: on your own

A deer lives at the edge of a forest next to a field. How does each part help it?

A city park has trees, a pond and a lawn. Name two organisms that could live there and what each one uses.

Why do many robins leave Ontario in the fall?

Can two very different organisms share the same habitat? Explain.

What might happen to a pill bug if its log dries out in the sun?

Challenge

A pet goldfish lives in a bowl. What does the owner have to provide that a pond would provide on its own?

Explain why a polar bear could not survive in a southern Ontario forest in summer, using the words temperature and food.

Describe the microhabitat under a rock. List what it gives a centipede.

Check your understanding

Quiz

What is a habitat?

Which of these is not a necessity of life?

A beaver's lodge gives it mostly...

The damp space under a log is an example of a...

Why do plants not need to find food the way animals do?

What should you do after looking under a log in a habitat?

For parents and teachers

This lesson introduces habitat as the place that meets all of an organism's needs. Get outside if you can: a backyard, balcony planter, park or schoolyard all count.

Common difficulties:

Children often think a habitat is just a home or shelter. Stress that a habitat provides all needs (food, water, air, shelter, space, temperature and light).
Plants also have needs; they make food rather than eat it.

Safety: Supervise outdoor exploring, avoid poison ivy and wild parsnip, do not handle wild animals or mushrooms, check for ticks after walking in long grass or woods, and wash hands afterward.