Ecosystem components, interactions and pollination
Classify the living and non-living parts of an ecosystem, explain relationships among organisms and trace pollination through seed and fruit formation.
Section Paper 2 · Environmental Management in Context
This original StudyForA sequence supports Cambridge IGCSE Environmental Management 0680 Topics 1–4 for exams in 2027, 2028 and 2029. Named local examples are chosen by the learner and centre; verify current conditions and local context with reliable sources. It is not a Cambridge paper, official grade or complete course.
Before you begin
- Use the 2027–2029 syllabus and check your exam year and centre's entry arrangements. Topics 1–4 are taught on this page; Topics 5–7 are still being built.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What happens after pollen reaches a stigma?
What you will learn
- Classify the living and non-living parts of an ecosystem, explain relationships among organisms and trace pollination through seed and fruit formation.
- Use evidence from an unfamiliar case to explain a cause-and-effect link and justify a suitable response.
Organise ecosystem components
A habitat is the place where an organism lives. A species is a group of organisms of the same kind; a population is members of one species in an area. A community is the populations living and interacting there, while a niche describes an organism's role and way of using resources.
A predator hunts prey. An apex predator is at the top of the food chain in the ecosystem being studied; it is not necessarily the largest animal everywhere.
Separate biotic and abiotic factors
Biotic components are living: producers, primary, secondary and tertiary consumers, and decomposers. Abiotic components are non-living conditions, including temperature, water, oxygen, carbon dioxide, salinity, light and pH.
Biotic and abiotic factors can affect one another. For example, light availability affects photosynthesis, while plant cover can influence conditions near the soil surface.
Explain interactions and pollination
Native species occur naturally in an area; an invasive species spreads and can cause harm in its introduced environment. Competition occurs when organisms need the same limited resource; predation is one organism feeding on another.
Pollination transfers pollen from an anther to a stigma. It may occur through insect pollinators or wind. Pollination is followed by fertilisation and then seed and fruit formation. Naming or drawing flower structures beyond anther and stigma is not required by this syllabus.
Sources for this lesson
Pause and explain
Which is an abiotic component?
Worked example
In a forest, a native flowering plant is pollinated by insects and eaten by a beetle. Classify four ecosystem components and describe the plant's reproductive sequence.
Show the worked solution
- The forest is a habitat; the plant and beetle are species, and all individuals of the beetle in the forest form a population.
- Plants are producers, beetles may be primary consumers, and light, water and temperature are abiotic factors.
- An insect transfers pollen from anther to stigma; fertilisation follows, then seeds and fruit form.
Answer The scenario includes habitat, species, population, a producer, a consumer and abiotic factors. Insect pollination transfers pollen from anther to stigma before fertilisation, seed and fruit formation.
Try a topic test
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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 pond has algae, insect larvae, fish, decomposers, light and dissolved oxygen. Classify the components and describe one possible feeding relationship.
Give me a hint
Sort living organisms from non-living conditions before connecting consumers.
Compare my reasoning
- Algae, insect larvae, fish and decomposers are biotic; light and dissolved oxygen are abiotic.
- Algae can act as producers, while larvae and fish may be consumers; the exact relationship depends on the organisms in the pond.
- A food chain should show a supported feeding pathway, not assume every fish eats every insect larva.
The organisms are biotic and light and dissolved oxygen are abiotic. Algae can be producers, and a food chain should be based on the actual feeding relationship.
Look for these in your work
- Living and non-living classified
- Producer role identified
- Relationship kept evidence-based
Explain how competition and predation differ, then classify an introduced plant that spreads rapidly and reduces native plants as a likely invasive species.
Give me a hint
Competition is a shared-resource relationship; predation involves one organism feeding on another.
Compare my reasoning
- Competition occurs when organisms need the same limited resource, such as light or space.
- Predation occurs when one organism captures and feeds on prey.
- The introduced plant is likely invasive in this scenario because it spreads and causes harm to native species.
Competition is a struggle for a limited resource; predation is a feeding interaction. The plant fits the syllabus description of an invasive species because it spreads and causes harm.
Look for these in your work
- Interactions distinguished
- Scenario evidence used
- Native and invasive terms used carefully
A reserve wants to increase pollination of a native plant. Recommend one way to protect insect pollinators and identify one measurement that could show whether pollination is occurring.
Give me a hint
Connect a habitat action to insect access, then measure a pollination outcome.
Compare my reasoning
- Maintain suitable flowering habitat and avoid unnecessary disturbance or harmful chemical exposure, following local guidance.
- Observe insect visits to flowers using a consistent sampling period and method.
- Also record the proportion of flowers forming fruit or seeds, while noting weather and other factors that could affect results.
Protecting suitable habitat may support insect pollinators. Consistent counts of visits and fruit or seed formation can provide evidence, though conditions and other pollinators should be considered.
Look for these in your work
- Action linked to pollinator habitat
- Observation method consistent
- Outcome and confounding factors considered
Common mistakes
- Confusing a population with a community
- Calling a non-living factor biotic
- Treating every introduced species as invasive without evidence of harm
- Placing fertilisation before pollination
What can you explain now?
Which term describes all populations living and interacting in an area?
Compare with the explanation
Community
The correct answer is “Community”. The alternatives “Population” and “Niche” do not match the syllabus concept. Classify the living and non-living parts of an ecosystem, explain relationships among organisms and trace pollination through seed and fruit formation.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Classify ecosystem components, distinguish key organism interactions and describe pollination through seed and fruit formation.
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.