Round and Round the Matter Goes
A 60-minute Grade 5 lesson on modelling how matter moves among plants, animals, decomposers and the environment.
Round and Round the Matter Goes is a free 60-minute Grade 5 science lesson plan for Common Core standard 5-LS2-1 — model how matter moves between plants, animals, decomposers and the environment. It is timed across 5 sections, gives the exact wording to use where the wording carries the mathematics, names 3 misconceptions with the teaching move that addresses each, and ends with an exit ticket and a printable worksheet with its answer key.
- Grade:
- Grade 5
- Length:
- 60 minutes
- Standard:
- 5-LS2-1
Grade 5 · Life Science
5-LS2-1
Develop a model to describe the movement of matter among plants, animals, decomposers, and the environment.
Objective
Students will be able to build a model showing matter moving in a cycle rather than a line.
Students are successful when they can
- Includes decomposers in the model.
- Shows matter returning to the environment.
- Says why the model is a cycle and not a chain.
What you need
- The compost bin record, arrow and label cards
- A jar of soil, leaves and worms for close observation
- The printable practice sheet linked at the end of this plan
The lesson
Warm-up
5 min- Show the compost record: 40 kg in September, 14 kg in June.
- Ask where the missing 26 kg went.
Teach — the arrows must come back
15 min- Build a food chain on the board: plant, rabbit, fox. Note that it ends.
- Ask what happens when the fox dies. Nothing yet on this diagram.
- Add decomposers and an arrow from every organism into them.
- Add arrows from decomposers back to the soil and the air.
- Add arrows from soil and air back into the plant. The diagram is now a cycle.
- Say the key claim: matter cycles, and the decomposers are what close it.
“Where does that arrow go next? Follow it until it comes back.”
Investigate — build the cycle
22 min- Groups build the cycle with cards and arrows, starting from a food chain.
- They must include decomposers and at least two returns to the environment.
- They trace one atom's path all the way round and describe it.
- They mark the step that would break if decomposers were removed.
Independent practice
15 min- Students complete the 'Round and Round the Matter Goes' page.
- Check the model returns matter to the environment.
Close
3 min- Ask what a world without decomposers would look like.
What goes wrong, and why
Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.
Draws a chain that ends at the top predator.
Why: Chains are the familiar model.
Fix: What happens to the fox's matter? Add the arrow.
Leaves decomposers out.
Why: They are unglamorous.
Fix: Without them nothing returns. The cycle does not close.
Thinks matter is used up.
Why: The compost lost 26 kg.
Fix: It became gas and water. It moved, it was not destroyed.
If they are not there yet
- A part-built cycle with two arrows missing.
- Cards labelled to place.
If they finish early
- Trace a carbon atom from air to plant to animal and back.
- Explain the compost's mass loss using the model.
- Say how the model would change in a pond.
Exit ticket
A food chain ends at the fox. What must be added to make it a cycle, and why?
What to look for: Decomposers, with arrows returning matter to the soil and air and back into plants. A chain with no return means the cycle idea needs another run.
Printable practice for 5-LS2-1
Free to print and copy, answer key included. Each sheet can generate a fresh set of problems for a retake.
- Round and Round the Matter GoesDraw a line from each event to the move it makes.
Questions about Round and Round the Matter Goes
How long does the Round and Round the Matter Goes lesson take?
60 minutes, split across 5 timed sections: warm-up 5 min, teach 15 min, investigate 22 min, independent practice 15 min, close 3 min. The minutes are stated per section and add up to the stated length, so the plan can be cut or extended at a section boundary rather than abandoned halfway.
Which standard does Round and Round the Matter Goes teach?
5-LS2-1 — 5-LS2-1, Life Science for Grade 5: “Develop a model to describe the movement of matter among plants, animals, decomposers, and the environment.” In plain terms, model how matter moves between plants, animals, decomposers and the environment.
What do I need to teach this lesson?
The compost bin record, arrow and label cards, a jar of soil, leaves and worms for close observation and the printable practice sheet linked at the end of this plan. Everything listed is either ordinary classroom equipment or a free printable from this site — there is nothing to buy and nothing to prepare beyond photocopying.
What mistakes should I expect in this lesson?
Three, each a reasoning error rather than carelessness: draws a chain that ends at the top predator; leaves decomposers out and thinks matter is used up. The plan gives the thinking behind each one and the teaching move that addresses the thinking rather than the symptom.
How do I know whether the lesson worked?
The exit ticket asks: “A food chain ends at the fox. What must be added to make it a cycle, and why?.” Decomposers, with arrows returning matter to the soil and air and back into plants. A chain with no return means the cycle idea needs another run. That tells you whether the class needs a reteach or a thirty-second conversation before you plan tomorrow.
Is there a worksheet to go with Round and Round the Matter Goes?
Yes — 1 printable 5-LS2-1 worksheet, linked at the end of the plan and free like the rest of the site. Each one comes with an answer key and 25 versions, so the practice after the lesson can be a different paper on every desk.
Is Round and Round the Matter Goes free to use?
Yes. The plan, its printables and their answer keys are free to read, print and photocopy for your own class, with no account and no email capture. It was last reviewed on 8 September 2026. Please do not resell it or republish it as your own.
Last reviewed 2026-09-08. Aligned to 5-LS2-1 of the Next Generation Science Standards.