Which of the following statements are true regarding the processes involved in t

Question

Which of the following statements are true regarding the processes involved in transitioning from Image A to Image B to Image C? Image A- Spring Image B - Summer Image C Fall Choose one or more: As summer transitions to fall, plant photosynthesis decreases, causing carbon dioxide to accumulate in the atmosphere During the summer months, plumes of carbon monoxide stream from fires in North America, Europe, and Asia, contributing to high concentrations in the atmosphere. During spring and summer in the northern hemisphere, plants absorb a substantial amount of carbon dioxide through photosynthesis, thus removing some of the gas from the atmosphere. During fall and winter in the northern hemisphere, plants absorb a substantial amount of carbon dioxide through photosynthesis, thus removing some of the gas from the atmosphere. During the summer months, plumes of carbon monoxide stream from fires in Africa, South America, and Australia, contributing to high concentrations in the atmosphere.

Explanation / Answer

Lets break the given options into two parts, one for CO2 (Carbon dioxide) and other for CO (Carbon monoxide). Firstly, the question asked should have a scale showing different colors for CO2 and CO, anyway as we know the sources and sinks of these emissions it is easy to answer and understand this question.

A. CO2

1, 3, 4 are for CO2, out of which only 1 and 3 are correct. Here is why:

We know from published research that measurements of CO2 in atmosphere have been around since 1958 and the images given show a higher concentration of CO2 in spring and fall. This is due to burning of fossil fuels, and from maps given it is evident that most of this upward trend lies in Northern hemisphere which is due to large land area as compared to Southern hemisphere. As summer approaches in Northern hemisphere the plants start to grow and photosynthesis increases, consuming more and more CO2 from the atmosphere as seen in B (option 3). Similarly as summer transitions to fall, photosynthesis decreases causing CO2 to accumulate (option 1) We are leaving option 4 because in Northern hemisphere, fall and winter means less photosynthesis by plants to save their energy, hence the dominant sources are plants, animals (including fossil fuels).

B. CO

2 and 5 are for CO, and the right answer is 5, here is why:

From image B it is evident that CO must be represented by a whitish color near Africa. If this is the case then option 5 is our answer because at the same time North America, Europe and Asia (given in option 2) doesn't show a similar trend while as Australia does (even a little).  

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