Explain and manage food security
Explain food insecurity and evaluate strategies for secure, safe and nutritious food supplies.
Section 5.1 · Food security
Exam scope and assessment notes
Original StudyForA teaching and practice, not Cambridge-authored questions, mark schemes or official grades. Cambridge expects candidates to study all eight topics, carry out investigative work and learn teacher-selected case studies. This course does not replace a centre's named case-study examples, current local environmental data, supervised fieldwork or the candidate's own investigation. Practice datasets are illustrative, not observations from a real place. No official assessment or certification is provided. The examples and practice datasets in these lessons are fictional and formative; learners must add their centre's verified case studies and current local evidence.
Before you begin
- Cambridge recommends prior environmental/science study equivalent to IGCSE or O Level. This is an AS-only qualification; use the exam-year syllabus and confirm centre entry details.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What makes environmental evidence useful?
What you will learn
- Define food security through access, availability and nutrition
- Analyse causes and impacts of food insecurity
- Compare production, storage, distribution and loss-reduction strategies
Security includes household access
Food security means all people, at all times, have physical, social and economic access to sufficient, safe and nutritious food that meets dietary needs and preferences. National production alone does not guarantee household access.
Syllabus threats include population growth, unsustainable and increasingly homogeneous global production, price setting, land degradation, agricultural disease, crops diverted to biofuels, climate change, water shortages and poverty. Impacts can include regional scarcity, malnutrition, poverty, forced migration, conflict, famine and death; explain a mechanism and identify who is affected.
Strategies have trade-offs
Compare subsistence agriculture with intensification and extensification. Improved techniques include aquaculture, hydroponics, selective breeding and GM crops; management can address limiting factors, weeds, fungal disease and pests. Other strategies include shifting some production from livestock to crops, reducing food waste, stockpiling, improving transport, protecting pollinators, food aid through the World Food Programme and rationing.
Evaluate yield, nutrition, access, water and land demand, ecological effects, cost and resilience. Higher total output may not improve nutrition if food remains unaffordable or distribution is unreliable. Match each strategy to the cause and affected group.
Sources for this lesson
Pause and explain
Why can high national food output coexist with food insecurity?
Worked example
A drought-prone region increases cereal yield through irrigation, but groundwater is falling. Evaluate the intervention.
Show the worked solution
- Identify the food-security gain.
- Trace water and energy costs or ecological risks.
- Suggest evidence and a more resilient combination.
Answer Irrigation can stabilise yields during dry periods. If groundwater is withdrawn faster than recharge, the gain may be temporary and deepen future insecurity. Compare water levels, yields, costs and access; consider efficiency, drought-tolerant crops, storage and diversified livelihoods.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A country exports staple crops while some households cannot afford enough food. Which food-security dimension is failing?
Give me a hint
Separate national availability from household access.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply define food security through access, availability and nutrition to the stated context.
- Explain the inference and one limitation or trade-off.
Food may be available nationally, but economic access is failing for some households. Examine food prices relative to income, household food-insecurity indicators and nutrition, disaggregated by region and group.
Look for these in your work
- Define food security through access, availability and nutrition
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
Compare intensification with extensification as ways to increase food production.
Give me a hint
Consider yield per area, land demand and input pressure.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply analyse causes and impacts of food insecurity to the stated context.
- Explain the inference and one limitation or trade-off.
Intensification raises output per area but may increase water, fertiliser or energy pressure. Extensification uses more land and can affect habitats, though input needs may differ. Suitability depends on local soils, land, ecosystems and costs.
Look for these in your work
- Analyse causes and impacts of food insecurity
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
A programme improves harvests but loses much of the crop before market. Suggest two steps and measures, and explain one other response if households still cannot afford food.
Give me a hint
Locate where losses occur, then separate physical availability from economic access.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply compare production, storage, distribution and loss-reduction strategies to the stated context.
- Explain the inference and one limitation or trade-off.
Find the crop and stage with highest loss. Better drying or storage can reduce spoilage; transport or local-market improvements can improve access. Compare loss rates, cost, prices and household access before and after. If households still cannot afford food, targeted food aid or rationing may address short-term access, while income and price evidence should guide longer-term action.
Look for these in your work
- Compare production, storage, distribution and loss-reduction strategies
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
Common mistakes
- Equating food security with national production
- Treating intensification as automatically sustainable
- Ignoring affordability and distribution
What can you explain now?
Why can high national food output coexist with food insecurity?
Compare with the explanation
Some households may lack affordable or physical access to nutritious food
Food security concerns access and nutrition as well as availability.
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Make it stick
Which linked dimensions are included in the syllabus definition of food security?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.