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Question 1 of 5
1. Question
Ocean acts as a large carbon sink due to
- Its large geographical coverage
- Difference in the partial pressure of carbon dioxide between seawater and air
- Rich population of phytoplankton and seagrass
Which of the above statements is/are correct?
Correct
Solution: d)
Oceans are one of the largest carbon sinks on earth because of their large geographical coverage and presence of rich population of phytoplankton and seagrass, which act as carbon sink.
Carbon dioxide readily dissolves in water and the oceans provide a huge reservoir of carbon. Across the world’s oceans there is a continual cycle of equilibration of dissolved carbon dioxide in water with carbon dioxide in the atmosphere.
The difference in partial pressure of the CO2 between seawater and air facilitate gaseous exchange. This allows atmospheric CO2 to dissolve in seawater.
Incorrect
Solution: d)
Oceans are one of the largest carbon sinks on earth because of their large geographical coverage and presence of rich population of phytoplankton and seagrass, which act as carbon sink.
Carbon dioxide readily dissolves in water and the oceans provide a huge reservoir of carbon. Across the world’s oceans there is a continual cycle of equilibration of dissolved carbon dioxide in water with carbon dioxide in the atmosphere.
The difference in partial pressure of the CO2 between seawater and air facilitate gaseous exchange. This allows atmospheric CO2 to dissolve in seawater.
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Question 2 of 5
2. Question
Which of the following clearly shows the importance of carbon dioxide in earth’s atmosphere?
- It is essential for the growth of plants.
- It absorbs the heat directly incoming from the Sun thus warming the planet.
- It is the most abundant gas in the atmosphere after nitrogen and oxygen.
Select the correct answer code:
Correct
Solution: a)
Statement 1: Green plants use CO2 gas to prepare their food through photosynthesis.
CO2 molecules don’t really interact with sunlight’s wavelengths. Only after the Earth absorbs sunlight and reemits the energy as infrared waves can the CO2 and other greenhouse gases absorb the energy.
Earth’s atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent.
Incorrect
Solution: a)
Statement 1: Green plants use CO2 gas to prepare their food through photosynthesis.
CO2 molecules don’t really interact with sunlight’s wavelengths. Only after the Earth absorbs sunlight and reemits the energy as infrared waves can the CO2 and other greenhouse gases absorb the energy.
Earth’s atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent.
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Question 3 of 5
3. Question
Which of the following are the Geoengineering techniques designed to tackle the effects of climate change?
- Artificial treesthat pull the CO2 from the atmosphere using plastic polymers.
- Adding large quantities of lime to the Ocean water to increase the amount of CO2 absorption by the oceans.
- Using unmanned ships to increase above-ocean cloud cover by spraying sea water into the air.
- Floating thousands of tiny mirrors in space between Earth and the sun.
Select the correct answer code:
Correct
Solution: d)
Geoengineering schemes are projects designed to tackle the effects of climate change directly, usually by removing CO2 from the air or limiting the amount of sunlight reaching the planet’s surface.
The first category of scheme – those designed to remove CO2 from the air – include machines (sometimes called “artificial trees”) that pull the gas from the atmosphere using plastic polymers. Other proposals seek to increase the amount of CO2 absorbed by the oceans – for example by adding large quantities of lime to the water.
In the second category – schemes designed to reduce the amount of sunlight reaching Earth – proposals include firing sulphate aerosols into the stratosphere to reflect sunlight back to space; using unmanned ships to increase above-ocean cloud cover by spraying sea water into the air; painting the world’s roofs white to increase reflectivity; and even floating thousands of tiny mirrors in space between Earth and the sun.
Incorrect
Solution: d)
Geoengineering schemes are projects designed to tackle the effects of climate change directly, usually by removing CO2 from the air or limiting the amount of sunlight reaching the planet’s surface.
The first category of scheme – those designed to remove CO2 from the air – include machines (sometimes called “artificial trees”) that pull the gas from the atmosphere using plastic polymers. Other proposals seek to increase the amount of CO2 absorbed by the oceans – for example by adding large quantities of lime to the water.
In the second category – schemes designed to reduce the amount of sunlight reaching Earth – proposals include firing sulphate aerosols into the stratosphere to reflect sunlight back to space; using unmanned ships to increase above-ocean cloud cover by spraying sea water into the air; painting the world’s roofs white to increase reflectivity; and even floating thousands of tiny mirrors in space between Earth and the sun.
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Question 4 of 5
4. Question
Which of these ecosystems would sequester most carbon for a given unit of area?
Correct
Solution: b)
Saltmarshes are one of the key coastal ‘blue carbon’ habitats, recognised for their ability to store carbon within above- and below-ground biomass and sediments.
Saltmarshes sequester carbon at a rate two to four times greater than that recorded for mature tropical forests.
Incorrect
Solution: b)
Saltmarshes are one of the key coastal ‘blue carbon’ habitats, recognised for their ability to store carbon within above- and below-ground biomass and sediments.
Saltmarshes sequester carbon at a rate two to four times greater than that recorded for mature tropical forests.
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Question 5 of 5
5. Question
Consider the following statements.
- Carbon neutrality refers to achieving net zero carbon dioxide emissions.
- Carbon neutrality can be achieved only by eliminating carbon dioxide emissions altogether.
- Renewable energy has a lesser to almost zero carbon emissions.
Which of the above statements is/are correct?
Correct
Solution: d)
Carbon neutrality refers to achieving net zero carbon dioxide emissions by balancing carbon dioxide emissions with removal (often through carbon offsetting) or simply eliminating carbon dioxide emissions altogether (the transition to the “post-carbon economy”).
Although both renewable and non-renewable energy both produce carbon emissions in some form, renewable energy has a lesser to almost zero carbon emissions.
Incorrect
Solution: d)
Carbon neutrality refers to achieving net zero carbon dioxide emissions by balancing carbon dioxide emissions with removal (often through carbon offsetting) or simply eliminating carbon dioxide emissions altogether (the transition to the “post-carbon economy”).
Although both renewable and non-renewable energy both produce carbon emissions in some form, renewable energy has a lesser to almost zero carbon emissions.
