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02 Jul 2021, 04:30
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B
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:
57% (01:34) correct
43%
(01:34)
wrong
based on 446
sessions
History
Date
Time
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Not Attempted Yet
During the process of photosynthesis, some of the light energy absorbed by chlorophylls is stored in the form of adenosine triphosphate (ATP); the rest is used for the removal of the electrons in water, to then be used in the reactions that turn carbon dioxide into organic compounds.
(A) to then be used in the reactions that turn carbon dioxide into organic compounds
(B) which are then used in the reactions that turn carbon dioxide into organic compounds
(C) which are then used in the reactions, turning carbon dioxide into organic compounds
(D) then used in the reactions that turn carbon dioxide into organic compounds
(E) which the reactions that turn carbon dioxide into organic compounds then use
(A) to then be used in the reactions that turn carbon dioxide into organic compounds
(B) which are then used in the reactions that turn carbon dioxide into organic compounds
(C) which are then used in the reactions, turning carbon dioxide into organic compounds
(D) then used in the reactions that turn carbon dioxide into organic compounds
(E) which the reactions that turn carbon dioxide into organic compounds then use
04 Jul 2021, 03:15
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OFFICIAL EXPLANATION
During the process of photosynthesis, some of the light energy absorbed by chlorophylls is stored in the form of adenosine triphosphate (ATP); the rest is used for the removal of the electrons in water, to then be used in the reactions that turn carbon dioxide into organic compounds.
(A) to then be used in the reactions that turn carbon dioxide into organic compounds
Incorrect.
This answer choice is stylistically flawed. The phrase to then be used is ambiguous and confusing, because it is not clear what it refers to, what will then be used - light energy or electrons?
Note, that this question focuses to a great extent on issues of correct style and clarity of expression, in addition to logic and correct grammatical form.
Look for an answer choice that is grammatically correct, logical AND most clearly expresses the nature and sequence of events in the process described.
(B) which are then used in the reactions that turn carbon dioxide into organic compounds
This answer choice corrects the ambiguity in the original question by using a relative clause (which are then used) instead of the non-conjugated form to be used, making it clear that electrons are used in the chemical process.
The corrected sentence also makes the sequence clear: first the electrons in water are removed and then used in the chemical reaction.
Note that in this construction, the complex noun phrase electrons in water is plural (similar to x of y subject), and is correctly modified by the relative clause which are then used, which uses a plural verb (are).
(C) which are then used in the reactions, turning carbon dioxide into organic compounds
Incorrect.
While this answer choice corrects the original ambiguity by using a relative clause (which is then used) instead of the non-conjugated form to be used, it introduces a change of meaning.
In the original phrase reactions that turn carbon dioxide [...], the relative pronoun that is used to define what kind of reactions these are. By changing that turn to turning and separating it with a comma the phrase tuning carbon dioxide [...] seems to describe the entire situation of using electrons, thereby conveying a different meaning.
Note, that this question focuses to a great extent on issues of correct style and clarity of expression, in addition to logic and correct grammatical form.
Look for an answer choice that is grammatically correct, logical AND most clearly expresses the nature and sequence of events in the process described.
(D) then used in the reactions that turn carbon dioxide into organic compounds
Incorrect.
This answer choice repeats the original stylistic flaw. The phrase then used is ambiguous and confusing, because it is not clear what it refers to, what is later used - light energy or electrons?
(E) which the reactions that turn carbon dioxide into organic compounds then use
Incorrect.
While this answer choice corrects the original ambiguity, it changes the meaning of the original sentence.
The original sentence states that electrons are used in the chemical reactions (i.e. the electrons are a part of the reactions), while this sentence states that the reactions are the ones who use the electrons (i.e. the reactions are those who manipulate the electrons).
General Discussion
21 Jul 2021, 08:32
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As far as i know, "which" directly refers to the ojbect preceding it, in our case it's water.
"which are" then will refer to "water", causing sv disagreement.
Please correct my thinking.
"which are" then will refer to "water", causing sv disagreement.
Please correct my thinking.
