research question – due in 2 hours



Why is it important to understand why carbon cycles through the ecosystems?

[removed] A.Because carbon is an essential element in all organic materials, and it is released into the atmosphere as a waste product of combustion, in the form of CO2, affecting global climates.


[removed] B.Because carbon is an essential element, and it is released into the atmosphere as carbonic acid, which contributes to acid precipitation


[removed] C.Because carbon is an essential element, and it is released into the atmosphere in the form of CO2, which is a primary ozone-depleting agent


[removed] D.Because carbon is an essential element in organic materials, and it is released into the atmosphere by plants, during photosynthetic activities

Question 2 of 10

10.0 Points

Carbon dioxide is considered a greenhouse gas because it can

[removed] A.Absorb green frequencies well


[removed] B.Absorb IR radiation well


[removed] C.Absorb UV radiation well


[removed] D.Because it can reflect EM radiation well


Question 3 of 10

10.0 Points

Why are greenhouse gasses important to life on earth?

[removed] A.Without them, the earth’s atmosphere would be too thin to support life


[removed] B.Greenhouse gasses react with water vapor providing water solutions ideal for plant growth


[removed] C.Without them, the earth’s average temperature would be too low to sustain life.


[removed] D.Greenhouse gasses protect the earth from UV radiation


Question 4 of 10

10.0 Points

Considering that there are other more powerful greenhouse gasses in the atmosphere, why did CO2 gained so much attention in the past decades?

[removed] A.Because CO2 levels have dropped about 50ppm in the last century, in which time the average global temperatures increased by 1º C, and numerous studies indicate strong correlations between the two events


[removed] B.Because anthropogenic CO2 levels into the atmosphere have risen almost 70ppm in the last century, in which time the average global temperatures increased by 1º C, and numerous studies indicate strong correlations between the two events.


[removed] C.Because, among the greenhouse gasses, CO2 is the only compound that is strictly linked to life on earth.


[removed] D.Because CO2 is the most stable greenhouse gas, and numerous studies indicate strong correlations between this instability and its high UV ray reflectivity




Plants remove carbon from the atmosphere through the process of photosynthesis. During this process, CO2 is converted into sugar, and makes up ______% of the glucose molecule.

[removed] A.50


[removed] B.30


[removed] C.45


[removed] D.40





Question 6 of 10

10.0 Points

How many kilograms of carbon are stored in a 160 kilograms log?

[removed] A.72


[removed] B.80


[removed] C.23


[removed] D.56




Question 7 of 10

10.0 Points

To how many kilograms of CO2 do 5 kilograms of dried tree correspond?


[removed] A.10.03


[removed] B.4.75


[removed] C.8.25



[removed] D.6.32

Question 8 of 10

10.0 Points

In the lab activity, why is the allometric equation important to us?


[removed] A.Because it enables us to identify the photosynthetic efficiencies, determining the amount of CO2 processed by each individual tree


[removed] B.Because it allows us to calculate the biomass of a tree by measuring only the diameter of the trunk at the base


[removed] C.Because it compensates for the human errors resulted during the measuring stage


[removed] D.Because it allows us to measure the biomass of a tree using only one instrument, making the overall plot measurements fast and effective



Question 9 of 10

10.0 Points

If the average biomass of a 10m x 10m plot is 2057 kg, how much carbon is stored in the plant tissues?

[removed] A.1,045.32 kg


[removed] B.734.28 kg


[removed] C.578.34 kg


[removed] D.925.65 kg


Question 10 of 10

10.0 Points

If the amount of carbon stored in the plant tissues of a certain plot is 5734 kg, how much CO2 has that plot removed from the atmosphere?

[removed] A.21,043.78 kg of CO2


[removed] B.10,467.22 kg of CO2


[removed] C.34,295.64 kg of CO2


[removed] D.9,232.25 kg of CO2



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