Cambridge IGCSE · Marine Science (0697)

Overview of human interactions with marine ecosystems: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Overview of human interactions with marine ecosystems.

10 questions28 marksFree, no account

Question 1

1 mark

Which of the following human activities involves dredging to remove resources from the seabed for use in construction and building?

Question 2

1 mark

Many marine ecosystems act as nursery areas for commercially important species. What is the primary benefit of these nursery areas to human populations?

Question 3

1 mark

Why is 'blast fishing' (using explosives) considered an unsustainable human activity compared to traditional line fishing?

Question 4

1 mark

Which of the following represents a direct economic benefit that humans derive from marine ecosystems?

Question 5

1 mark

Eutrophication, often caused by human activities such as agricultural runoff, leads to an algal bloom in marine ecosystems. What is the subsequent impact on dissolved oxygen levels that negatively affects other marine organisms?

Question 6

2 marks

State one way in which marine ecosystems provide a direct source of building materials for human use.

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Question 7

3 marks

Describe the impact of oil spills on the physical characteristics of marine mammals and birds that inhabit affected areas.

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Question 8

5 marks

Explain how the dredging of seabed resources for the construction of infrastructure can lead to the decline of local fisheries.

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Question 9

5 marks

Human activities profoundly influence marine ecosystems, both positively and negatively.

(a) Outline two reasons why healthy marine ecosystems are important to human populations.
(b) Describe one negative impact of commercial fishing practices, such as trawling, on marine habitats.
(c) Define the term 'sustainable harvesting' in the context of marine resources.

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Question 10

8 marks

Marine ecosystems are of significant importance to human populations, yet they are increasingly threatened by various human activities.

(a) State three ways in which marine ecosystems provide direct benefits or resources to humans. (3 marks)

(b) Describe how the removal of resources, specifically through the dredging of sand and mud, can negatively impact the biodiversity of a coastal ecosystem. (2 marks)

(c) Define the term sustainable resource and explain how implementing a closed season helps ensure that a fishery remains sustainable. (3 marks)

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