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27 Dec 2021, 08:00
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
64% (02:18) correct
36%
(02:30)
wrong
based on 337
sessions
History
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Not Attempted Yet
Recent experiments in the Southern Ocean offer the promise of controlling the threat of global warming by creating organic "sponges" for carbon dioxide, which is widely considered the main culprit for rising global temperatures. Scientists were able to grow a lush strip of phytoplankton 150 kilometers long by fertilizing a patch of the ocean with hundreds of kilograms of an iron compound. Phytoplankton presently accounts for over half of the photosynthesis on Earth, the process by which carbon dioxide is absorbed and converted into oxygen. A major limiting factor in the production of phytoplankton is lack of iron, but by fertilizing oceans with iron compounds scientists hope to be able to reduce carbon dioxide levels and reverse the greenhouse effect.
Which of the following, if true, casts the most serious doubt upon the advisability of using the fertilization method described above to control carbon dioxide levels?
(A) In some oceans, the growth of phytoplankton is also limited by how much nitrogen, phosphorus, and silicon are available.
(B) The cost of fertilizing the oceans with sufficient quantities of iron to reverse the greenhouse effect is likely to be very high.
(C) Iron naturally reaches the seas in the form of wind-blown mineral dust, which becomes more or less abundant as conditions on land change.
(D) Fertilization efforts will do nothing to curb the production of more carbon dioxide emissions.
(E) The oceans are a complex system, and the long-term consequences of ocean fertilization may be the opposite of what is predicted.
Which of the following, if true, casts the most serious doubt upon the advisability of using the fertilization method described above to control carbon dioxide levels?
(A) In some oceans, the growth of phytoplankton is also limited by how much nitrogen, phosphorus, and silicon are available.
(B) The cost of fertilizing the oceans with sufficient quantities of iron to reverse the greenhouse effect is likely to be very high.
(C) Iron naturally reaches the seas in the form of wind-blown mineral dust, which becomes more or less abundant as conditions on land change.
(D) Fertilization efforts will do nothing to curb the production of more carbon dioxide emissions.
(E) The oceans are a complex system, and the long-term consequences of ocean fertilization may be the opposite of what is predicted.
28 Dec 2021, 05:54
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Bunuel
Emphasis on most serious.
(A) In some oceans, the growth of phytoplankton is also limited by how much nitrogen, phosphorus, and silicon are available.
If this condition exists in some areas we can always choose areas that have an abundance of those.
Also, sentences using some, most are generally wrong but i am putting less emphasis on that fact as blindly omitting those statements may turn out to be wrong.
(B) The cost of fertilizing the oceans with sufficient quantities of iron to reverse the greenhouse effect is likely to be very high.
Cost is not of concern here.
(C) Iron naturally reaches the seas in the form of wind-blown mineral dust, which becomes more or less abundant as conditions on land change.
This statement tells us why some areas lack iron and others don't. This is helping no way in arriving at our answer.
(D) Fertilization efforts will do nothing to curb the production of more carbon dioxide emissions.
Even though it's true and we can keep it for a while but as earlier said we are looking for an option that puts the most dent to the conclusion.
(E) The oceans are a complex system, and the long-term consequences of ocean fertilization may be the opposite of what is predicted.
Bingo.! If this turns out to be true then the whole conclusion will break down. Choose E over D in this case.
kanishaksharma
Joined: 30 Mar 2021
Last visit: 30 Mar 2023
Posts: 42
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Given Kudos: 184
Location: India
Concentration: Operations, General Management
Schools: ISB '23 (D)
GMAT 1: 690 Q48 V37
WE:Engineering (Manufacturing)
03 Aug 2022, 10:15
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I am still not convinced why C is wrong ?
