Matter Cycling in Ecosystems
Develop a model to describe the movement of matter among plants, animals, decomposers, and the environment in an ecosystem
Lesson
Set out your lesson
“Matter does not vanish when a leaf falls. Fungi and bacteria break down organic material. Earthworms help by eating and fragmenting litter; they are detritivores, not microbes. Plants take up mineral nutrients and water through roots, but most of their new dry mass comes from carbon dioxide, not soil. Safety: Do not handle soil organisms, mould or decay. Stop: Stop after tracing one complete path. Do not make a compost jar or collect rotting matter.”
Bring to the table
- Paper
- Pencil
Extra for the adult
Worked example. I trace soil mineral matter → oak leaf → caterpillar → remains → microbial breakdown → soil mineral matter. The answer is a cycle because some matter can re-enter plants. A decomposer also builds its own body and respires, so not everything returns to soil immediately.
Optional challenge. Explain why removing dead litter could change nutrient availability without saying all nutrients disappear at once. Adult key: Removing litter removes a nutrient-containing input and habitat, but other soil nutrients and inputs may remain.
What to notice. Keep the model and explanation. Note adult help with detritivore, mineral or arrow labels.
Share and support
Family records and proof options
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Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.
Learning resources
Extra practice links — they do not replace Gakuva’s teaching approach.
NASA Climate Kids · Practice link — not the full lesson
Plants and Animals
Before you open · source notes
Plants and Animals supports Matter Cycling in Ecosystems. An adult previews and guides; this is a learning page, not a scored quiz.
Free educational page, no sign-in required for the tested path.
Before you openAsk the learner one fact they learned and one question they still have.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public NASA Climate Kids page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
NASA Climate Kids. “Plants and Animals.” External page; Gakuva does not copy, host, embed, or redistribute materials.
Unknown — link only
Check understanding
- Describe the role of decomposers (fungi, bacteria, worms) in breaking down dead matter
- Trace the movement of matter: plant grows using soil nutrients → animal eats plant → animal dies → decomposers return nutrients to soil
- Create or interpret a simple diagram showing matter cycling through an ecosystem
“Can your child explain what happens to a fallen leaf on the forest floor — how tiny organisms break it down and the nutrients go back into the soil to help new plants grow?”
Curriculum record
- Type
- Conceptual
- Subject
- Science
- Domain
- Ecosystems & Habitats
- Age range
- Ages 10–11
Standards