Practice Ecosystems and Ecology with authentic IB Environmental systems and societies (ESS - Old) 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

Describe three factors that can limit population growth in nature.

[3]

Question 2

SL & HLPaper 2

Describe two ecosystem services provided by healthy ecosystems.

[4]

Question 3

SL & HLPaper 2

Explain how you would measure the impact of pollution on a freshwater ecosystem.

[4]

Question 4

SL & HLPaper 2

Explain how abiotic factors can be measured in an ecosystem investigation.

Choose two factors and describe the measurement method for each.

[4]

Question 5

SL & HLPaper 2

Explain the First Law of Thermodynamics and its relevance to ecosystem energy flow.

[3]

Question 6

SL & HLPaper 2

Describe two methods for estimating population size in an ecosystem.

[4]

Question 7

SL & HLPaper 2

Describe two methods used to measure biodiversity in an ecosystem.

[4]

Question 8

SL & HLPaper 1

Analyze the following diagram of a pond ecosystem:

Identify two distinct zones visible in the diagram.

[2]

Explain how one abiotic factor changes across these zones.

[2]

Question 9

SL & HLPaper 2

Explain the importance of replication in ecological field studies.

[3]

Question 10

SL & HLPaper 2

Describe the process of primary succession, including pioneer species and climax community.

[4]