Basic Science and Technology – Primary 6 Weekly Short Class Lesson Notes for Second Term

WEEK 3 (3) – MEANING OF GLOBAL WARMING

Global warming is the gradual increase in the temperature of the Earth caused mainly by too much heat being trapped in the atmosphere. This happens when gases from human activities prevent heat from escaping into space.

 

CAUSES OF GLOBAL WARMING (Brief)

1. Burning of fossil fuels (petrol, diesel, coal)

2. Smoke from factories and vehicles

3. Cutting down of trees (deforestation)

4. Bush burning

 

EFFECTS OF GLOBAL WARMING 

1. Increase in temperature – The weather becomes hotter than normal.

2. Melting of ice – Ice at the North and South Poles melts.

3. Rising sea level – Coastal areas may be flooded.

4. Irregular rainfall – Too much or too little rain.

5. Drought – Long periods without rain.

6. Flooding – Heavy rainfall causing overflow of water.

7. Poor crop production – Crops do not grow well.

8. Spread of diseases – Heat helps diseases to spread faster.

 

10 MULTIPLE CHOICE QUESTIONS AND ANSWERS ON GLOBAL WARMING

INSTRUCTION – Choose the correct answer from the options A – D. 

1. Global warming means ______. 

A. increase in the Earth’s temperature

B. cooling of the Earth

C. change in wind direction

D. heavy rainfall

 

2. The main cause of global warming is ______. 

A. planting trees

B. burning of fossil fuels

C. rainfall

D. wind

 

3. Which gas is mainly responsible for global warming?

A. Oxygen

B. Nitrogen

C. Carbon dioxide

D. Hydrogen

 

4. One effect of global warming is ______. 

A. lower sea level

B. melting of ice

C. cooler weather

D. less sunlight

 

5. Global warming can cause ______. 

A. drought

B. good harvest always

C. stable weather

D. clean air

 

6. Cutting down trees increases global warming because trees ______. 

A. cause rainfall

B. produce smoke

C. absorb carbon dioxide

D. increase heat

 

7. Global warming affects farmers by causing ______. 

A. regular rainfall

B. irregular rainfall

C. fertile soil

D. good crops

 

8. One way to reduce global warming is to ______. 

A. burn more fuel

B. cut more trees

C. plant more trees

D. increase smoke

 

9. Global warming can lead to ______. 

A. flooding

B. drought

C. spread of diseases

D. all of the above

 

10. Global warming is harmful because it ______. 

A. damages the environment

B. improves health

C. makes weather stable

D. increases food supply

 

FILL IN THE GAP QUESTIONS

11. Global warming is the gradual increase in the ______ of the Earth.

12. The main gas responsible for global warming is ______.

13. Cutting down trees increases global warming because trees absorb ______.

14. One effect of global warming is the melting of ______.

15. Planting more trees helps to ______ global warming.

 

SHORT ANSWER QUESTIONS

16. What is global warming?

17. Mention one cause of global warming.

18. State two effects of global warming.

19. How does global warming affect the environment?

20. Give one way to prevent global warming.

 

ANSWER KEYS 

1. A 2. B 3. C 4. B 5. A 6. C 7. B 8. C 9. D 10. A 11. temperature 12. carbon dioxide 13. carbon dioxide 14. ice 15. reduce

16. Global warming is the gradual increase in the Earth’s temperature.

17. Burning of fossil fuels.

18. Flooding and drought.

19. It causes high temperature, melting of ice, and rising sea level.

20. Planting trees.