1.The decrease in CO 2 within each year likely reflects the uptake of CO 2 by pl
ID: 261452 • Letter: 1
Question
1.The decrease in CO2 within each year likely reflects the uptake of CO2 by plants during spring and summer.
2.The additional CO2 in the atmosphere heats the Earth by absorbing radiation from the sun.
3. because of teleconnections from circulating air and water, the samples in this graph likely reflect changes in the atmospheric CO2 recorded at other places on Earth.
4. because of negative feedback, the concentration of CO2 will continue to increase even if people were to cease burning fossil fuels.
5.During this period, the concentration of carbon in the oceans likely increased.
By burning fossil fuels, humans release more than 10 billion tonnes of C02 per year. This gas enters the atmosphere and subsequently diffuses into the tissue of plants or bodies of water around the world. The net effect of CO2 emissions has been an exponential increase in the concentration of CO2 in the atmosphere. The figure below shows the changes in the concentration of CO2 in the atmosphere between 1958 and 1993, recorded at a research station in Hawaii Atmospheric Concentration of Carbon Dioxide (Mauna Loa Data) 34) 330 320 1955 1 10 020 195 190 195Explanation / Answer
1. During spring and summer, plants are likely to be highly active interms of produceing fruits, new leaves etc. This increased activity results in increased uptake of CO2. This may reduce the atmospheric CO2 in these particular seasons.
ANSWER: True
2. Solar radiation is absobed by the earth and reflected back to the atmosphere. Greenhouse gases such as CO2 absorbs the reflected radiation from the earth surface which increases the heat on the earth surface leading to increased temperature.
ANSWER: False
3. The levels of CO2 changes depending to the place. However the change in CO2 levels are not much affected by the places. So the above graph can indicate the changes of CO2 in other places too.
ANSWER: True
4. because of negative feedback, the concentration of CO2 will increase only for a period when people were to cease burning fossil fuels. After that the CO2 concentration reduces. Furthermore, the CO2 released from fossil fuels are only a part of total CO2 produced.
ANSWER: False
5. The CO2 present in the atmosphere is stored in the ocean in the form of carbon. So even if we stop emitting CO2, there will be atmospheric CO2 present. So the carbon level in the ocean will increase.
ANSWER: True
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