Practice Topic 2: Ecology with authentic IB Environmental systems and societies (ESS) exam questions for both SL and HL students. This question bank mirrors Paper 1, 2 structure, covering key topics like ecosystems, human impact, and sustainability. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Paper
Level
Question 1
SL & HLPaper 2
1.[3]
Describe three factors that can limit population growth in nature.
Question 2
SL & HLPaper 2
1.[4]
Describe two ecosystem services provided by healthy ecosystems.
Question 3
SL & HLPaper 2
1.[4]
Explain how you would measure the impact of pollution on a freshwater ecosystem.
Question 4
SL & HLPaper 2
Explain how abiotic factors can be measured in an ecosystem investigation.
1.[4]
Choose two factors and describe the measurement method for each.
Question 5
SL & HLPaper 2
1.[3]
Explain the First Law of Thermodynamics and its relevance to ecosystem energy flow.
Question 6
SL & HLPaper 2
1.[4]
Describe two methods for estimating population size in an ecosystem.
Question 7
SL & HLPaper 2
1.[4]
Describe two methods used to measure biodiversity in an ecosystem.
Question 8
SL & HLPaper 1
Analyze the following diagram of a pond ecosystem:
1.[2]
Identify two distinct zones visible in the diagram.
2.[2]
Explain how one abiotic factor changes across these zones.
Question 9
SL & HLPaper 2
1.[3]
Explain the importance of replication in ecological field studies.
Question 10
SL & HLPaper 2
1.[4]
Describe the process of primary succession, including pioneer species and climax community.