Conservation of Matter
Conservation of Matter (applied to ecosystems) is a Grade 5 science concept from Amplify Science (California) applying the fundamental law that matter is never created or destroyed to living systems. When a plant grows, the matter comes from the air and soil — not from nowhere. When an animal eats, the food's matter becomes the animal's matter. When organisms die and decompose, their matter returns to the environment. Covered across chapters, this concept ensures students understand that all biological processes conserve the total amount of matter in the ecosystem.
Key Concepts
It is important to remember: when water evaporates, it is not destroyed. The total amount of water stays the same.
This is the law of conservation of matter . The water molecules simply change their "address" from the ocean to the atmosphere, and their "state" from liquid to gas. Nothing is lost.
Common Questions
Is matter created when a plant grows?
No, matter is not created when a plant grows. The plant's mass comes from the matter it gathers from its environment: mostly carbon dioxide from the air and water from the soil. The plant rearranges and combines these molecules into new organic compounds, but no new matter is created.
Where does a tree get its mass?
Most of a tree's mass comes from carbon dioxide in the air. Through photosynthesis, trees convert CO₂ molecules (from air) and water (from soil) into glucose sugar, then into wood and other organic compounds. The carbon from CO₂ becomes the carbon in the tree's trunk, branches, and leaves.
What happens to matter when an animal eats?
When an animal eats, the food's matter is broken down by digestion and absorbed into the animal's body. The matter is redistributed — some builds new body tissue, some provides energy (released as heat and CO₂), and some is excreted as waste. The total matter is conserved; it just moved from food to the animal's body.
How does conservation of matter apply to decomposition?
When organisms die, decomposers break them down into simpler compounds. The matter in the organism doesn't disappear — it becomes CO₂ released into the air, water, and nutrients released into the soil. These materials are then available for plants to absorb and use again.
When do 5th graders learn about conservation of matter in ecosystems?
Conservation of matter in living systems is covered in 5th grade science. Amplify Science California Grade 5 applies this principle across its ecosystem chapters, tracing where matter comes from and where it goes as it moves through food chains and decomposition.
What is a closed system in terms of matter?
A closed system is one where matter cannot enter or leave. Earth is approximately a closed system for matter — almost no matter enters from space or leaves Earth's gravity. This means the same matter is recycled over and over through living and non-living systems indefinitely.
Which textbook covers conservation of matter in ecosystems for 5th grade?
Amplify Science (California) Grade 5 applies conservation of matter throughout its ecosystem chapters, consistently tracing the source and destination of matter as it moves through plants, animals, decomposers, and the non-living environment.