Describe advantages and disadvantages of monocultures
A large-scale monoculture grows one crop species over a large area; consistent production can simplify operations but makes the area less diverse.
Section 20.1 · Food supply
Exam scope and assessment notes
Core and Extended · Biology 0970, 2026–2028. Use the stated specimen features and evidence. Diagrams are schematic. Written practice is self-checked; human subject-teacher review, supervised practical competence and cumulative assessment remain pending. Cambridge states that IGCSE 0970 has the same subject content as IGCSE 0610, with 9–1 grading. This StudyForA pathway maps the 2026–2028 syllabus only. This 9–1 graded qualification is available only in a limited number of administrative zones. Confirm that your centre can enter you for this code and exam series with Cambridge International. Cambridge has published a separate syllabus for 2029. StudyForA has not reconciled that version yet; this page supports exams in 2026, 2027 and 2028 only.
Before you begin
- Know that crop and livestock production depend on both management and environmental conditions.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What is grown in a monoculture?
What you will learn
- Describe advantages of large-scale crop monocultures
- Describe disadvantages using crop vulnerability and diversity
Understand a large-scale monoculture
A monoculture is the large-scale cultivation of one crop species in an area. Growing one crop can make planting, crop care and harvesting more standardised. Machinery and management can be planned for the same crop, and large quantities of one product can be harvested together.
These features can make production operations simpler, but they do not guarantee a high yield. Soil, water, disease, pests and weather can still affect the crop.
Weigh the risks of low crop diversity
If many plants are the same crop species, a pest or disease able to affect that crop may spread through a large area. A problem with the one crop can reduce a large share of the harvest. A monoculture also supports fewer crop species in that field than a mixed-crop system.
A disadvantage does not mean every monoculture fails. Compare the stated scale, crop, pest or disease and management conditions. Use “can” or “may” where the result depends on context.
Pause and explain
Why can a pest be a risk in a large monoculture?
Worked example
A farm grows one crop species across 300 hectares. Give one advantage and one disadvantage of this system.
Show the worked solution
- Uniform planting can support standardised management.
- A crop-specific pest may affect a large area.
Answer An advantage is that planting and harvesting can be standardised and mechanised. A disadvantage is that a pest or disease affecting that crop may damage much of the large, similar crop area.
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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.
State two advantages of growing one crop over a large area.
Give me a hint
Think about consistent field operations and product.
Compare my reasoning
- Planting and harvesting can be standardised.
- Machinery and management can be organised for one crop, producing a large quantity together.
Operations can be standardised for one crop, and machinery can be planned efficiently; the farm can also harvest a large quantity of the same crop at one time.
Look for these in your work
- Two advantages stated
- Benefits qualified
Give two disadvantages or risks of a large monoculture.
Give me a hint
Consider crop diversity and a shared pest risk.
Compare my reasoning
- The field contains fewer crop species than a mixed-crop system.
- A crop-specific pest or disease may affect a large area of similar plants.
A monoculture has low crop-species diversity in the field, and a pest or disease able to affect that crop may spread across much of the large area. Neither effect guarantees total crop failure.
Look for these in your work
- Diversity addressed
- Vulnerability explained
A disease reduces yield by 30% in a monoculture but by 8% in a mixed planting. Calculate the difference and state one limitation of this comparison.
Give me a hint
Subtract the two percentage losses.
Compare my reasoning
- 30% − 8% = 22 percentage points.
- Other differences between the systems may affect the result.
The loss was 22 percentage points greater in the monoculture. The comparison suggests greater impact in this example, but other differences in crop, conditions or management would need to be considered before assigning the whole difference to planting pattern.
Look for these in your work
- Difference correct
- Evidence limit stated
Common mistakes
- Treating monoculture as a mixed crop system
- Saying a pest must destroy the whole harvest
- Listing only advantages or only disadvantages
What can you explain now?
What is grown in a monoculture?
Compare with the explanation
One crop species on a large area
This is the system described.
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Make it stick
Describe one operational advantage and one biological risk of a large-scale monoculture.
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