AQA · GCSE · Biology

    Course version: 8461 · Version from Sept 2018

    All materials in the living world are recycled to provide the building…

    Full specification wording

    How materials are cycled: All materials in the living world are recycled to provide the building blocks for future organisms.

    In the living world, matter is not destroyed but recycled.

    Checked against the AQA 8461 specification (opens in a new tab) on .

    • Point 2 of 5
    • 4 key terms

    Study notes

    From the checked teaching notes for this specification point.

    The idea

    In the living world, matter is not destroyed but recycled. Carbon, water, nitrogen, oxygen and mineral ions pass between organisms and the environment. Decomposers break down dead organisms and waste products, releasing mineral ions and carbon dioxide. Producers take up these materials and use them to build new biological molecules. For example, carbon from dead leaves is released as carbon dioxide by decomposition and then fixed by photosynthesis into glucose in a new plant. This recycling provides the building blocks, such as carbohydrates, proteins and nucleic acids, for future organisms. It means ecosystems can continue to support life without a constant new supply of matter.

    What earns the marks

    • State that materials in the living world are recycled rather than used up.
    • Describe how decomposers break down dead organisms and waste, releasing materials back to the environment.
    • Explain that producers take up recycled materials to build biological molecules for growth.
    • Give an example of a recycled material, such as carbon from dead leaves becoming carbon dioxide and then glucose in a new plant.
    • Explain that recycling provides building blocks for future organisms and supports continued life in an ecosystem.

    Common mistakes and how to put them right

    • Saying materials are lost when organisms die.

      Put it right: Decomposers return the materials to the environment for reuse.

    • Confusing recycling of matter with recycling of energy.

      Put it right: Matter is recycled, but energy flows through and is lost as heat.

    • Thinking only carbon is recycled.

      Put it right: Water, nitrogen, oxygen and mineral ions are also recycled.

    Exam tips

    • Use the phrase building blocks and name at least one type of biological molecule in your answer.
    • Give a specific example of a material moving from a dead organism to a new organism.
    • Avoid saying energy is recycled; state clearly that matter is recycled while energy flows.

    Try the lesson

    The start of the How materials are cycled: All materials in the living world are recycled to provide the building blocks for future organisms. lesson, made from checked teaching notes for this specification point.

    Have a go first

    Which statement describes what happens to the materials in the living world?

    Listen

    In the living world, matter is not destroyed but recycled. Carbon, water, nitrogen, oxygen and mineral ions pass between organisms and the environment. Decomposers break down dead organisms and waste products, releasing mineral ions and carbon dioxide. Producers take up these materials and use them to build new biological molecules. For example, carbon from dead leaves is released as carbon dioxide by decomposition and then fixed by photosynthesis into glucose in a new plant. This recycling provides the building blocks, such as carbohydrates, proteins and nucleic acids, for future organisms. It means ecosystems can continue to support life without a constant new supply of matter. A strong answer earns marks for these points. State that materials in the living world are recycled rather than used up. Describe how decomposers break down dead organisms and waste, releasing materials back to the environment. Explain that producers take up recycled materials to build biological molecules for growth. Give an example of a recycled material, such as carbon from dead leaves becoming carbon dioxide and then glucose in a new plant. A common slip: Saying materials are lost when organisms die. Instead, decomposers return the materials to the environment for reuse. Exam tip: Use the phrase building blocks and name at least one type of biological molecule in your answer.

    See it

    A vertical flowchart with six boxes joined by downward arrows, forming a loop. The top box reads 'Dead organisms and waste products' and points down to 'Decomposers break them down'. That points down to 'Materials released to the environment', which points down to 'Producers take up recycled materials'. That points down to 'Biological molecules built for growth', which points down to 'Building blocks for future organisms'. An arrow then leads from this last box back up to the first box, 'Dead organisms and waste products', showing the cycle repeating.
    It shows how decomposers release materials from dead organisms and waste, which producers take up to build biological molecules that become building blocks for future organisms, whose remains are decomposed again.

    Key words

    Say what each word means before you turn the card.

    Recycling of matter

    Try answering aloud or in your head before turning the card.

    Decomposition and decay

    Try answering aloud or in your head before turning the card.

    Building blocks for life

    Try answering aloud or in your head before turning the card.

    Sustainable ecosystems

    Try answering aloud or in your head before turning the card.

    See every definition
    Recycling of matter
    Materials in the living world are recycled rather than used up, passing between organisms and the environment.
    Decomposition and decay
    Decomposers break down dead organisms and waste products, releasing mineral ions and carbon dioxide back to the environment.
    Building blocks for life
    Recycled materials provide the building blocks, such as carbohydrates, proteins and nucleic acids, for future organisms.
    Sustainable ecosystems
    Recycling means ecosystems can continue to support life without a constant new supply of matter.

    Label the diagram

    Some boxes have lost their names. Pick the right name for each number.

    The diagram again, with 3 boxes numbered instead of named. A vertical flowchart with six boxes joined by downward arrows, forming a loop. The top box reads 'Dead organisms and waste products' and points down to 'Decomposers break them down'. That points down to 'Materials released to the environment', which points down to 'Producers take up recycled materials'. That points down to 'Biological molecules built for growth', which points down to 'Building blocks for future organisms'. An arrow then leads from this last box back up to the first box, 'Dead organisms and waste products', showing the cycle repeating.

    • 1Box 1

    • 2Box 2

    • 3Box 3

    0 of 3 labelled

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