Topic 7: 7.2 The biosphere is a vital life- support system for people as it provides both goods and services — Edexcel GCSE Geography B
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Topic 7: 7.2 The biosphere is a vital life- support system for people as it provides both goods and services explained
Topic 7: 7.2 The biosphere is a vital life- support system for people as it provides both goods and services covers 3 specification points, including A.
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How the biosphere provides resources for… and B. How the biosphere regulates the composition…. Open a point below for its explanation and revision guidance.
a. How the biosphere provides resources for Indigenous and other local people (food, medicine, building materials and fuel resources) but is also increasingly exploited commercially for energy, water and mineral resources.
This statement contrasts two uses of the biosphere. First, Indigenous and other local people depend on it directly for food, medicine, building materials and fuel, such as harvesting fruit, using plants for traditional remedies, cutting timber for houses and collecting firewood. Second, the biosphere is increasingly exploited commercially for energy, water and mineral resources, for example through hydroelectric dams that use river flow, large-scale mining that removes ore and soil, or water abstraction for farming or industry. Explain that local use is often small-scale and can be sustainable, whereas commercial exploitation is often larger in scale and can damage habitats. Use a named example and link each use to a resource type.
b. How the biosphere regulates the composition of the atmosphere, maintains soil health and regulates water within the hydrological cycle, providing globally important services.
The biosphere is all life on Earth and its habitats, and it provides services as well as goods. This statement asks for three regulating services. Atmospheric composition: photosynthesis takes in carbon dioxide and releases oxygen, while respiration returns carbon dioxide, keeping gases balanced. Soil health: decomposers break down dead organic matter, recycling nutrients and forming humus that improves soil structure. Water regulation: vegetation intercepts rainfall and reduces runoff, while transpiration returns water vapour to the air to support rainfall. These are globally important because the processes operate over very large areas, sustaining food, freshwater and climate stability for people. For each service, name the process, state its effect and give the human benefit.
c. The global and regional trends increasing demand for food, energy and water resources (population growth, rising affluence, urbanisation and industrialisation) and theories on the relationships between population and resources (Malthus and Boserup).
Global and regional trends show rising demand for food, energy and water, driven by population growth, rising affluence, urbanisation and industrialisation. Population growth increases the number of people needing resources. Rising affluence increases consumption per person, while urbanisation concentrates demand in cities and industrialisation raises energy and water use. Malthus argued that population grows faster than food supply, so checks such as famine or disease would limit numbers. Boserup argued that population pressure can drive agricultural intensification and innovation, so food supply adapts. Use a named example for each driver and compare how the two theories view population and resources.
Your focus
- Identify food, medicine, building materials and fuel as resources that local people obtain from the biosphere.
- Explain how commercial exploitation for energy, water or minerals differs in scale from local use.
- Give a named example of commercial exploitation and describe one environmental consequence.
Show all 9 objectives
- Explain how photosynthesis and respiration help regulate the composition of the atmosphere.
- Describe how decomposition and humus formation maintain soil health.
- Explain how vegetation affects water regulation within the hydrological cycle and why these services are globally important.
- Explain how population growth, rising affluence, urbanisation and industrialisation increase demand for food, energy and water.
- Describe the main ideas of Malthus and Boserup about population and resources.
- Compare the Malthusian and Boserupian views of the relationship between population and resources.
Topic 7: 7.2 The biosphere is a vital life- support system for people as it provides both goods and services exam tips
Marking Points
- Identifies at least one local use (food, medicine, building materials or fuel) and attributes it to Indigenous or other local people.
- Identifies commercial exploitation for energy, water or mineral resources as a separate and increasing use of the biosphere.
- Gives a named or specific example that shows the scale of each use.
- Compares the scale or sustainability of local and commercial use rather than only listing them.
- Explains the environmental consequence of commercial use, such as habitat loss or disturbance from mining or dam construction.
- Identifies photosynthesis and respiration as biological processes that regulate the balance of carbon dioxide and oxygen in the atmosphere.
- Explains that decomposers recycle nutrients from dead organic matter and form humus, which improves soil structure and fertility.
- Describes vegetation interception, reduced surface runoff and increased infiltration as ways the biosphere regulates water in the hydrological cycle.
- Links transpiration to the return of water vapour to the atmosphere and its contribution to rainfall.
- Explains why these services are globally important by referring to their large-scale operation and their benefit to food, water and climate for people.
- Identifies population growth as a driver of increased demand for food and water.
- Explains that rising affluence increases consumption per person, including demand for energy and water.
- Describes how urbanisation concentrates demand for resources in cities and how industrialisation raises energy and water use.
- Outlines Malthus's view that population growth outpaces food supply, so natural checks would limit population.
- Outlines Boserup's view that population pressure can encourage agricultural intensification and technological innovation.
- Compares the two theories by stating whether each sees population growth as a limit on resources or as a stimulus to adapting resource supply.
Examiner Tips
- 💡Use a named example for each contrasting use so that the scale difference is clear.
- 💡Make one explicit comparison between local and commercial use in every answer.
- 💡Link each use to food, medicine, building materials, fuel, energy, water or minerals, and state one consequence.
- 💡Name one process for each of the three areas: atmospheric composition, soil health and the hydrological cycle.
- 💡For each process, write a linking phrase such as 'this means' or 'as a result' to show the effect on the service.
- 💡Finish with a sentence on global importance, referring to scale and to benefits for food, water or climate.
- 💡Use one example for each driver, such as a named country or region, and state the resource affected.
- 💡Structure a comparison by taking Malthus and Boserup in turn, then stating one clear difference between them.
- 💡Check that each theory is linked to the relationship between population and resources rather than described in isolation.
Common Mistakes
- Presents Indigenous people as unable to manage resources; correct this by describing their use as an established, often sustainable, relationship with the biosphere.
- Treats all resource use as equally harmful; correct this by distinguishing small-scale local use from larger commercial exploitation.
- Describes mineral extraction only in terms of economic value; correct this by explaining how it removes or disturbs habitats and soils.
- Lists uses without linking any of them to a resource type; state which resource each use provides.
- Treats the biosphere only as a source of food and timber, which are goods; the statement asks for regulating services, so the response should explain processes instead.
- Describes soil only as a place where crops grow, missing the role of decomposers and humus in recycling nutrients; the response should name the biological process involved.
- Gives a process without its effect or human benefit, so the answer stays descriptive; the response should state what the process regulates and why this matters to people.
- Lists the four drivers without linking any of them to food, energy or water, so the answer lacks explanation; the response should state which resource each driver increases.
- Presents Malthus and Boserup as describing the same relationship, which misrepresents their views; the response should contrast a limiting view with an adaptive view.
- Treats urbanisation as only a population issue, missing its effect on concentrated resource demand; the response should explain how cities increase demand for food, energy and water.