Cambridge IGCSE · Marine Science (0697)

Understanding climate change: Practice Questions

5 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Understanding climate change.

9 questions23 marksFree, no account

Question 1

1 mark

According to the syllabus, which of the following is a likely impact of increasing greenhouse gases on marine ecosystems?

Question 2

1 mark

Increasing concentrations of atmospheric carbon dioxide lead to which two primary changes in seawater chemistry, impacting marine organisms?

Question 3

1 mark

Increased greenhouse gas concentrations are predicted to impact marine ecosystems in several ways. Which of the following is a documented ecological consequence of rising sea temperatures?

Question 4

1 mark

According to the syllabus, which two factors have changed significantly in different regions on Earth when comparing the climate from 335 million years ago to the present day?

Question 5

1 mark

Apart from carbon dioxide \( (CO_2) \), which gas is identified as a major pollutant contributing to the enhanced greenhouse effect and subsequent climate change?

Question 6

3 marks

Describe the specific chemical effect that increasing concentrations of atmospheric carbon dioxide have on the acidity of seawater.

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Question 7

5 marks

Compare the mechanisms by which thermal expansion and the melting of land-based ice contribute to global sea level rise.

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Question 8

3 marks

Human activities have led to an increase in atmospheric pollutants that impact the global climate and the marine environment.

(a) Name two gases that contribute to the enhanced greenhouse effect and climate change. (1 mark)

(b) State two effects that increasing atmospheric \(CO_2\) concentrations have on the properties of sea water. (1 mark)

(c) Describe one potential impact of increasing greenhouse gases on marine ecosystems. (1 mark)

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Question 9

7 marks

Climate change is altering the physical and chemical properties of the World Ocean.

(a) Contrast the effects of thermal expansion of seawater and the melting of land-based ice on global sea levels. (3 marks)

(b) Describe how increasing atmospheric carbon dioxide (\(CO_2\)) concentrations affect the pH of sea water and the potential biological impact of this change. (2 marks)

(c) Aside from sea level rise, outline two other possible impacts of increasing greenhouse gases on marine ecosystems. (2 marks)

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