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ESS HL Exam Practice Questions

Chapter-by-chapter IB Environmental Systems and Societies HL exam questions with full worked solutions, covering ecosystems, biodiversity, water, soil, climate, energy and human populations.

25 sets Structured questions 8 chapters Worked Solutions
Level: SL HL
Jump to: 🌍 Environmental Foundations and Sustainability 🌱 Ecology and Ecosystem Processes πŸ¦‹ Biodiversity, Evolution and Conservation πŸ’§ Water Systems and Aquatic Resources 🌾 Land, Soil and Food Systems ☁️ Atmosphere and Climate Change ⚑ Natural Resources, Energy and Waste πŸ™οΈ Human Populations and Urban Environments
1

Chapter 1

Environmental Foundations and Sustainability

3 topics with full worked solutions

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Environmental Perspectives and Values

Factors shaping environmental viewpoints, personal and societal values, contrasting worldviews, and the historical development of environmental movements.

Understanding Environmental Systems

Systems thinking, different types of systems, equilibrium and feedback processes, tipping points, resilience, and the use of models to represent environmental interactions.

Sustainability and Sustainable Development

Core principles of sustainability, sustainable development, environmental justice, sustainability indicators, citizen science, sustainability frameworks, and alternative economic models.

2

Chapter 2

Ecology and Ecosystem Processes

5 topics with full worked solutions

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Organisms, Populations and Ecological Communities

Ecological systems, classification and taxonomic methods, human populations, factors affecting populations, population growth, population investigation, ecosystem functioning, advanced classification, fundamental and realised niches, and life-cycle strategies.

Energy Flow, Biomass and Productivity

Energy transfer through ecosystems, photosynthesis, respiration, trophic levels, food chains and food webs, energy losses, productivity and biomass, ecological pyramids, human impacts on energy and matter flows, autotrophs and heterotrophs, primary and secondary productivity, sustainable yield, and ecological efficiency.

Biogeochemical and Nutrient Cycles

Major biogeochemical cycles, carbon cycling, human disruption of the carbon cycle, strategies to reduce carbon impacts, carbon stores, the nitrogen cycle, and human influences on nitrogen cycling.

Climate Systems and Global Biomes

Weather and climate, major biomes, atmospheric circulation, ocean currents, different climate types, El NiΓ±o–Southern Oscillation, and links between tropical cyclones and climate change.

Ecosystem Succession, Stability and Change

Zonation, ecological succession, ecosystem resilience and stability, factors influencing succession, changes in productivity during succession, reproductive strategies, and the development of climax communities.

3

Chapter 3

Biodiversity, Evolution and Conservation

2 topics with full worked solutions

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Biodiversity and Evolutionary Processes

Biodiversity and ecosystem resilience, evolutionary processes, biodiversity assessment and management, genetic diversity, reproductive isolation, biodiversity hotspots, human effects on evolution, the geological timescale, mass extinction events, and the Anthropocene.

Conservation, Restoration and Regeneration

Biodiversity preservation, conservation strategies, habitat management, protected-area design, rewilding, planetary boundaries for biodiversity, conservation perspectives, conservation organisations, habitat restoration, assessment of conservation success, and ecotourism.

4

Chapter 4

Water Systems and Aquatic Resources

4 topics with full worked solutions

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Water Systems and Ocean Processes

The hydrological cycle, human impacts on water systems, physical and chemical properties of water, carbon sequestration and ocean acidification, water stratification, upwelling, and ocean circulation.

Water Access, Use and Security

Factors affecting freshwater availability, methods of increasing supply, responses to water scarcity, freshwater use, water stress, strategies for managing water stress, and issues of water equity.

Aquatic Food Production and Sustainable Harvesting

Aquatic food webs, rising human demand, overexploitation and unsustainable harvesting, mitigation strategies, aquaculture, climate change and ocean acidification, ocean productivity and nutrient dynamics, fish-stock assessment, sustainable harvesting, recovery of depleted fish populations, and regulation and ethics of marine harvesting.

Water Pollution and Water Quality

Sources of water pollution, plastic contamination, water-quality monitoring, eutrophication, pollution-management strategies, water quality in aquatic ecosystems, sewage treatment, water-quality indicators, drinking-water standards, and approaches to reducing pollution.

5

Chapter 5

Land, Soil and Food Systems

1 topic with full worked solutions

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Soil Systems and Soil Processes

Soil composition and structure, soil functions and properties, soil profiles and horizons, factors affecting soil formation, variation in soil characteristics, and carbon release from soils.

6

Chapter 6

Atmosphere and Climate Change

4 topics with full worked solutions

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Atmospheric Systems and Processes

Atmospheric composition and functions, the greenhouse effect, atmospheric dynamics, changes with altitude, Milankovitch cycles, hothouse Earth conditions, and links between atmospheric composition and the evolution of life.

Climate Mitigation, Adaptation and Intervention

International climate action, decarbonisation, mitigation and adaptation strategies, broader climate responses, greenhouse-gas emission scenarios, climate technologies, geoengineering, challenges of climate intervention, and differing stakeholder perspectives.

Stratospheric Ozone and Atmospheric Protection

Ultraviolet radiation, stratospheric ozone, the Montreal Protocol, ozone depletion, polar ozone loss, and the environmental roles of chlorofluorocarbons and hydrofluorocarbons.

7

Chapter 7

Natural Resources, Energy and Waste

3 topics with full worked solutions

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Natural Capital and Resource Management

Natural capital and natural income, valuation of natural resources, sustainable resource use, resource security and choices, uses of natural capital, environmental impact assessment, unsustainable exploitation of renewable resources, and natural-resource security.

Energy Resources and Energy Security

Energy sources and sustainability, patterns of energy consumption, energy choices, storage and conservation, energy security, fossil-fuel reserves, nuclear power, and battery-storage technologies.

Solid Waste and Waste Management

Types and sources of waste, environmental and social consequences of waste, disposal methods, and strategies for reducing and managing solid waste.

8

Chapter 8

Human Populations and Urban Environments

3 topics with full worked solutions

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Population Dynamics and Environmental Pressure

Human population change, approaches to managing population growth, population composition and modelling, links between population growth and environmental stress, dependency ratios, population momentum, population patterns and trends, and environmental migration.

Urban Systems and Sustainable City Planning

Characteristics of urban areas, urbanisation, urban expansion, urban planning, ecological approaches to city design, urban sustainability models, and green architecture.

Urban Air Pollution and Atmospheric Quality

Causes of urban air pollution, pollution-management strategies, acid rain, photochemical smog, and the environmental and health impacts of tropospheric ozone.

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