F2 - SEM1 - Living things and air - 7.6 Flashcards
What happen if Carbon dioxide level rises?
7.6 Balance of oxygen and carbon dioxide in Nature
- enhance greenhouse effect
- causing global warming
7.6 Balance of oxygen and carbon dioxide in Nature
What are the effects of Global warming?
7.6 Balance of oxygen and carbon dioxide in Nature
Living things in Polar regions to lose their habitats and die
Flooding of low-lying areas
Unusual weather patterns, more typhoons and droughts
7.6 Balance of oxygen and carbon dioxide in Nature
Which two processes keep a balance of oxygen and carbon dioxide in Nature?
7.6 Balance of oxygen and carbon dioxide in Nature
Respiration
Photosynthesis
7.6 Balance of oxygen and carbon dioxide in Nature
____ carry out respiration. ____ carry out photosynthesis.
7.6 Balance of oxygen and carbon dioxide in Nature
Living things carry out respiration. Plants carry out photosynthesis.
7.6 Balance of oxygen and carbon dioxide in Nature
How to keep a balance of oxygen and carbon dioxide in Nature?
7.6 Balance of oxygen and carbon dioxide in Nature
- Oxygen: taken up by living things during respiration replaced by given out by plants during photosynthesis
- Carbon dioxide: produced by living things during respiration is taken up by plants for photosynthesis
7.6 Balance of oxygen and carbon dioxide in Nature
Why the level of carbon dioxide in the atmosphere has risen sharply in the last hundreds of years?
7.6 Balance of oxygen and carbon dioxide in Nature
- Large amounts of fossil fuels are burnt to meet the needs for transport, industrial activites or other purposes => gives out a large amount of carbon dioxide
- Large areas of forests are cleared to obtain timber or land => less carbon dioxide is absorbed by plants for photosynthesis, carbon dioxide in atmosphere increases
7.6 Balance of oxygen and carbon dioxide in Nature
____ are disrupting the balance of carbon dioxide in Nature.
7.6 Balance of oxygen and carbon dioxide in Nature
Human activites are disrupting the balance of carbon dioxide in Nature.
7.6 Balance of oxygen and carbon dioxide in Nature
What is greenhouse effect?
7.6 Balance of oxygen and carbon dioxide in Nature
Some gases in the atmosphere trap thermal energy in the atmosphere and keep the Earth warm.
7.6 Balance of oxygen and carbon dioxide in Nature
What is the gases trap thermal energy in the atmosphere?
7.6 Balance of oxygen and carbon dioxide in Nature
Greenhouse gases
7.6 Balance of oxygen and carbon dioxide in Nature
Give an example of greenhouse gases
7.6 Balance of oxygen and carbon dioxide in Nature
Carbon dioxide
7.6 Balance of oxygen and carbon dioxide in Nature
Explain what is global warming
7.6 Balance of oxygen and carbon dioxide in Nature
Amount of carbon dioxide increase in atmosphere
=> traps more thermal energy and enhances greenhouse effect
=> increase average temperature of the Earth to increase
7.6 Balance of oxygen and carbon dioxide in Nature
True or False?
Carbon dioxide is a greenhouse gas that is harmful to the environment
7.6 Balance of oxygen and carbon dioxide in Nature
False
7.6 Balance of oxygen and carbon dioxide in Nature
True of False?
Photosynthesis is important to all living things on Earth because it helps control the amount of carbon dioxide in the atmosphere
7.6 Balance of oxygen and carbon dioxide in Nature
True
7.6 Balance of oxygen and carbon dioxide in Nature
Suggest 2 human activities cause an increase in the amount of carbon dioxide in the atmosphere
7.6 Balance of oxygen and carbon dioxide in Nature
- Clearing large areas of forest to obain timber
- Burning fossil fuels in vehicles
7.6 Balance of oxygen and carbon dioxide in Nature
Suggest 3 ways can help stopping global warming
7.6 Balance of oxygen and carbon dioxide in Nature
Develop clean energy e,g,, solar energy to replace fossil fuels
Use less wood products e.g., made from timber harvested from tropical rainforests
Switch off electrical appliances when they are not in use
7.6 Balance of oxygen and carbon dioxide in Nature
