SEC23 GEOG Chapt10 Global Warming Qs

Earth: Our Home 2 (S/E and N(A)) QUESTION BANK Chapter 10

CHAPTER 10: GLOBAL WARMING AND OZONE DEPLETION

Multiple-choice Questions (15 marks)

1. What is the ‘greenhouse effect’?

A The Sun’s rays warm the Earth’s surface and lower atmosphere.B When haze combines with water vapour, the Earth’s surface

and lower atmosphere get warm.C Gases that trap the Sun’s rays cause the warming of the Earth’s

surface and lower atmosphere. D The gases in the Earth’s atmosphere warm the Earth’s surface

and lower atmosphere.

Ans: C

2. Why is the greenhouse effect important?

A This allows all living things to live in an environment that has a constant temperature.

B This allows green plants to survive and to photosynthesise and produce food.

C This allows plants that can only be grown in a greenhouse to survive temperature fluctuations.

D This allows all living things to survive in an environment that is not too hot or too cold.

Ans: D

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3. Study the photograph below. Why is the use of this substance one of the causes of global warming?

A The liquids that are released cause more heat to be trapped inthe atmosphere.

B The gases that are released cause the Earth’s surface to heat up faster.

C The liquids that are released cause the Earth’s atmosphere and surface to heat up.

D The gases that are released cause more heat to be trapped in the atmosphere.

Ans: D

4. Study the photograph below. What are the gases that are released through this human activity?




A Sulphur dioxide and methaneB Methane and nitrous oxideC Carbon dioxide and carbon monoxideD CFCs and carbon dioxide Ans: B

5. What is the impact of global warming on plants?

A In colder regions, a warmer climate may allow people to grow new crops.

B Global warming generally encourages plant growth as temperatures are higher.

C Plants are affected by diseases that are brought about by high temperatures.

D Production of food crops increases due to higher temperatures.

Ans: A

6. How are people affected by global warming?

I. More people catch pneumonia.II. There is an increase in tropical diseases. III. More people develop eye cataracts.IV. More people suffer from dehydration.

A I and IIB II and IVC II, III and IVD All of the above Ans: B




7. Study the photograph below. How does global warming affect people living in places such as the one in the photograph?

A Rising temperatures can cause sea levels to rise and flood the coastal areas.

B Coastal waters freeze and cause ice sheets to form and cover the coastal areas.

C Global warming triggers tsunamis which then flood and destroy the coastal areas.

D Coastal areas are reduced when the land mass shrinks due to global warming.

Ans: A

8. How does ozone depletion occur?

A It occurs when oxygen atoms are added to ozone molecules. B It occurs when carbon atoms destroy ozone molecules in the

ozone layer.C It occurs when sulphur dioxide attacks ozone molecules in the

ozone layer.




D It occurs when chlorine atoms destroy ozone molecules in the ozone layer.

Ans: D

9. Which one of the following is an example of substances that cause ozone depletion?

A Old television setsB Insulation packagingC Gas heaterD Computer monitor Ans: B

10. What is the function of the ozone layer?

A It helps to prevent the Earth from cooling down.B It helps to protect us from rises in temperature.C It helps to protect us from harmful ultraviolet rays.D It helps to keep the Earth’s atmosphere free from pollutants.

Ans: C

11. Study the photograph below. How does this photograph show a consequence of ozone depletion on people?




are needed to see this picture.


Source: Singapore National Eye Centre

A People may have weakened immunity through exposure to ultraviolet radiation.

B People may develop cataracts through exposure to ultraviolet radiation.

C People may develop cataracts due to rises in temperature.D People may develop eye diseases such as typhoid due to rises

in temperature.

Ans: B

12. How does the Montreal Protocol help to reduce ozone depletion?

A The Montreal Protocol sets out to stop the use of greenhouse gases.

B The Montreal Protocol sets out to stop the emissions of toxic gases.

C The Montreal Protocol sets out to reduce the production of greenhouse gases.

D The Montreal Protocol sets out to reduce the use and production of CFCs.

Ans: D

13. Why are hybrid cars an alternative to other types of vehicles?

A Hybrid cars use solar-powered engines and water to run more efficiently.

B Hybrid cars use diesel-powered engines to run more efficiently.C Hybrid cars use both petrol and electric batteries to run more

efficiently.D Hybrid cars use high quality petroleum to run more efficiently.

Ans: C




14. Study the label below. How does this help people to be responsible consumers?

Courtesy of National Environment Agency

A It allows people to choose energy-efficient products.






B It allows people to save electricity.C It allows people to reduce the cost of the products.D It allows people to differentiate one product from another.

Ans: A

15. How can we reduce the impact of global warming?

A By putting CFCs into old refrigerators and air-conditionersB By buying products that are non-CFC-free to reduce emissions

of harmful gasesC By using more electricity at a time to reduce the amount of fossil

fuels being burntD By taking public transport to our destinations instead of private

vehicles

Ans: D

Structured Essay Question (15 marks)

1. Study the cartoon below carefully.






(a) What is the environmental problem that is presented in this cartoon? [2]

- The problem that is portrayed in this cartoon is global warming.- Global warming refers to the increase in air temperatures throughout the world.

(b) Explain the causes of this problem. [4]

- Global warming is caused by the emissions of greenhouse gases.- Due to increased human activities, more greenhouse gases such as carbon dioxide, CFCs, nitrous oxide and methane are released into the atmosphere. - These gases trap heat in the Earth’s atmosphere.- This results in the increased warming of the Earth’s surface and lower atmosphere.

(c) Describe the consequences of this problem as shown in the cartoon. [2]

- The melting of the ice caps at the North Pole causes the sea levels to rise. - This results in flooding.

(d) Why do you think the cartoonist portrays the consequences of this problem taking place at the North Pole? [4]

- The extent of global warming is greater at the Poles.- The North Pole experiences a higher rate of increase in temperature.- This is because when ice and snow in this region melt, the ground has less white surface to reflect sunlight.- More sunlight is now absorbed by the dark-coloured ground as well as by the ocean.

(e) What can be done to reduce the impact of this problem? [3]

- Countries can accede to the Kyoto Protocol and agree to reduce the emissions of greenhouse gases.- Governments can use alternative sources of energy such as solar and hydro-electric energy instead of fossil fuels.- Individuals can buy energy-efficient products to reduce the use




of electricity.

(Also accept other plausible answers.)



SEC23 GEOG Chapt10 Global Warming Qs

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