Body structures for survival (grade 4) · lesson

Plant parts and their jobs

💡 Each part of a plant has a job that helps the plant live and make new plants.

Roots take in water from the soil. They also hold the plant in place.

The stem carries water up from the roots to the leaves. In a tree, the stem is the trunk. Leaves catch sunlight to make food.

Flowers make seeds. Bright colors and sweet smells bring insects, which carry pollen from flower to flower.

Seeds need to spread out. Some seeds have hooks that stick to fur. An animal carries them to a new spot.

🧠 How to think about it

Ask where the part is and what is around it. Roots are in soil, where the water is. So they take in water.

roots: plant parts underground that take in water
stem: the plant part that carries water up and holds the plant up
pollen: a powder flowers need to make seeds

Animal parts and their jobs

💡 The shape of an animal's body part tells you what job it does.

Fish take in oxygen from water with gills. Birds fly with wings. Their hollow bones make them light.

Ducks have webbed feet that push water like paddles. Their oily feathers keep them dry.

Beaks come in many shapes. A long, thin beak sips nectar. A thick, short beak cracks nuts. A strong, pointed beak pecks holes in wood to find insects.

🧠 Let's work it out

Look at the shape and think of a tool.
A pointed beak is like a chisel.
A chisel is for digging into wood.

What do you think comes next?

gills: body parts fish use to take oxygen from water
webbed feet: feet with skin between the toes, for swimming

Parts that protect

💡 Some body parts, like thorns, shells, and quills, make a living thing hard to eat.

Many plants and animals have parts that keep them safe.

Rose thorns hurt, so animals leave the stems alone. A turtle has a hard shell to hide in. A porcupine has sharp quills.

Not every part is for safety. A frog's sticky tongue is for catching food.

🧠 How to think about it

Ask: would this part make a hungry animal stop? Sharp or hard parts protect. Parts for grabbing or sipping help with eating.

quills: sharp, stiff spines on a porcupine

Body parts that fit the habitat

💡 A plant's or animal's body parts often match the place it lives, like hot, cold, wet, or dry.

A desert is dry. A cactus has a thick stem that stores water. Its waxy skin keeps the water in.

A cold place needs warmth. Thick fur and a layer of fat hold in heat. Small ears lose less heat.

So you can use body parts as clues about where something lives.

🧠 Let's work it out

Ask what the body part helps with.
Holds in heat? It lives somewhere cold.
Saves water? It lives somewhere dry.

What do you think comes next?

waxy: smooth and coated, so water can't get out easily