According to some botanists, invasive plants are the second

Question

According to some botanists, invasive plants are the second most serious  threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems .

A. threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems 
B. threat, after habitat loss, to native species of plants and animals and for maintaining biologically diverse ecosystems 
C. threat, after losing their habitat, to native species of plants and animals and also to maintenance of biologically diverse ecosystems 
D. threat to native species of plants and animals and for maintaining biologically diverse ecosystems, after habitat loss 
E. threat to native species of plants and animals as well as to maintaining biologically diverse ecosystems, after losing their habitat

BukrsGmat · Accepted Answer

According to some botanists, invasive plants are the second most serious  threat, after habitat loss,
to native species of plants and animals and to the maintenance of biologically diverse ecosystems.

A. threat, after habitat loss, to native species of plants and animals and to the maintenance of
biologically diverse ecosystems

B. threat, after habitat loss, to native species of plants and animals and  for maintaining  biologically
diverse ecosystems ->  parallelism issue

C. threat,  after losing their habitat , to native species of plants and animals and also to maintenance
of biologically diverse ecosystems->  the first threat is habitat loss , second is invasive plants; after losing changes meaning

D. threat to native species of plants and animals and  for maintaining  biologically diverse
ecosystems, after habitat loss->  threat to - for maintaining not parallel

E. threat to native species of plants and animals as well as  to maintaining  biologically diverse
ecosystems, after losing their habitat ->  to maintain is correct

so ans: A

mejia401 · Answer

First look:   Parallelism, diction, grammatical construction (and)

A. threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems  OK - It's parallel and logical. But, "to the maintenance of..." seems wordy, so I wanted to see if there was a better choice first.

B. threat, after habitat loss, to native species of plants and animals and for maintaining biologically diverse ecosystems  Wrong - "threat to" is the correct idiom, while "threat for" has a connotation that the threat came from "maintaining..."

C. threat, after losing their habitat, to native species of plants and animals and also to maintenance of biologically diverse ecosystems  Wrong - There is no clear referent for "their." "And also" is redundant.

D. threat to native species of plants and animals and for maintaining biologically diverse ecosystems, after habitat loss  Wrong - "threat to" is the correct idiom.

E. threat to native species of plants and animals as well as to maintaining biologically diverse ecosystems, after losing their habitat  Wrong - "To maintaining" is not valid infinitive construction.

IMO A

kripalkavi · Answer

It has to be a A since all the options are marked A! :lol:

Ok, now for the reasoning B, D and E are not parallel C has the ambigous 'their'

farhanchaudhary · Answer

Meaning 
Some botanists believe invasive plants are second most serious threat to native species of plants and animals and also to the biologically diverse eco-system.
Habitat loss is the topmost threat( according to the botanists who believe invasive plants are second most serious threat)
 
Error Analysis 
According to some botanists
invasive plants are the second most serious threat" S- Invasive plants verb- "are.."
 -after habitat loss,--prepositional phrase,
to "native species....." and to"maintain biologically....".........To X and To Y. Parallel

No Error

POE 
A. threat, after habitat loss, to native species of plants and animals and to the
maintenance of biologically diverse ecosystems-  Correct Choice 
B. threat, after habitat loss, to native species of plants and animals and for
maintaining biologically diverse ecosystems-  To"X" and For"Y" not parallel 
C. threat, after losing their habitat, to native species of plants and animals and
also to maintenance of biologically diverse ecosystems- To "X" and "Also to Y" not parallel 
D. threat to native species of plants and animals and for maintaining biologically
diverse ecosystems, after habitat loss-  Same error as B 
E. threat to native species of plants and animals as well as to maintaining
biologically diverse ecosystems, after losing their habitat-  To "X" and As well as"Y" Not parallel.

daagh · Answer

The phrase - after habitat loss- contained inside a couple of commas seems to be a non-essential modifier, which seems to be wrong. If that phrase is removed, the fact that they are the second most serious threat has no meaning. The OA seems dubious as per structural norms.

anairamitch1804 · Answer

B and D: the second most serious threat...FOR maintaining biologically diverse ecosystems 
Here, threat FOR is unidiomatic. 
The correct idiom is X is a threat TO Y. 
Eliminate B and D.

C: invasive species are the second most serious threat, after losing their habitat 
Here, "their" seems to refer to "invasive species", implying that INVASIVE SPECIES are losing their habitat. 
The intended meaning is that NATIVE SPECIES lose their habitat. 
Eliminate C.

E: maintaining biologically diverse ecosystems, after losing their habitat 
Here, "their" seems to refer "diverse ecosystems", implying that "DIVERSE ECOSYSTEMS" are losing their habitat. 
The intended meaning is that NATIVE SPECIES lose their habitat. 
Eliminate E. 
The correct answer is A.

sdlife · Answer

Hi Experts /  GMATNinja  /  chetan2u  /  sayantanc2k  /  anairamitch1804 ,

Can you please tell the function of the prep. phrase "after habitat loss" in this question? Is is acting as a verb modifier or the noun modifier? Thanks!

egmat · Answer

Hello sdlife , I will be glad to help you with this one.

Prepositional phrases modify either a noun or an action in a sentence. In this official sentence, the prepositional phrase after habitat loss modifies the action are . It intends to say that after habitat loss, invasive plants are the next biggest threat. Hope this helps.

Thanks. Shraddha

Lampard42 · Answer

generis  - Could you help me on this. Stuck between A and B.

Is threat to native species and for maintaining" not parallel?

generis · Answer

Arvind42 , you asked about parallelism. Before we consider parallelism, we should eliminate (B) because it is not idiomatic. The correct idiom in this context is X is a threat TO something , not X is a threat FOR something. • idiom: threat TO not threat for Two examples of questions that test "threat" are below the spoiler. Spoiler alert : if you click on the linked official questions, you will probably know the answer based on this post. HERE, #1 HERE, #2 (B) is incorrect because threat for is not idiomatic. • parallelism I am not sure I understand what you are asking. I think your question might be, "Irrespective of idiom, are the noun phrase native species of plants and animals and the gerund phrase maintaining biologically diverse ecosystems parallel?" Answer: No. It's a good question. I see a lot of confusion about gerunds, nouns, and parallelism. Rather than just say "No, option B is not parallel because XYZ," instead I'll use some examples so that perhaps a little bit of understandable confusion gets cleared up. Rather than analyze (B) separately, we can compare (A) and (B). Option A uses two noun phrases: native species of plants and animals and the maintenance of biologically diverse ecosystems Option B, by contrast, uses a noun phrase ( native species . . . ) and a gerund phrase ( maintaining biologically diverse ecosystems ). -- If a dedicated noun exists, GMAC prefers that noun to an ___ING noun (a gerund, a verbING noun). -- The dedicated noun is maintenance (in option A). The ___ING noun is maintaining (in B). On the GMAT, for example, the voters' approval is better than the voters' approving. In OG 2020 SC # 835, the official explanation mentions the preference. Spoiler alert: 1 answer of 5 revealed. D) In experimenting designed to provide information ultimately proving useful to XYZ . . . OE: The use of the verbal noun experimenting is less idiomatic than experiments. In SC #842 of the same book, a noun and a gerund are deemed "not parallel" in three answers. Spoiler alert: those three are revealed. in his book, "Essay on Heat and Light," B) a critique of all chemistry following R.B. and also his envisioning of a OE: Critique and his envisioning are not parallel C) a critique of all chemistry after R.B. and envisioning as well as OE: The two descriptors are not parallel D) critiquing all chemistry from R.B. forward and also a vision of OE: The two descriptors are not parallel The OE for SC # 895, option (D) explains that a gerund and noun are not parallel. Spoiler alert: 1 answer of 5 revealed. OE for option (D): This use of the gerund vaccinating (followed by of ) would normally be preceded by the , but would make the phrase awkward. It would be preferable to use vaccination , which is parallel to extermination . In other words, even if vaccinating were a complex gerund preceded by THE, and even though complex gerunds may be parallel with action nouns such as extermination , the dedicated noun form vaccination is preferred. Finally, see OG VR 2020 #304. In that question, 2 of 5 options were not parallel because a list of four items included three noun phrases and an __ING noun. (The OE writer calls it a participle.) Spoiler alert - 2 answers revealed. Early administrative decisions in China’s Ming Dynasty eventually caused a drastic fall in tax revenues, a reduction in military preparedness, the collapse of the currency system, and failed to make sufficient investment in vital transportation infrastructure. B. the collapse of the currency system, and failing D. the collapse of the currency system, as well as failing OE for both B and D: The list of three effects is not parallel since the first three items are noun phrases but the fourth is the participle failing . I tracked down these examples because there are occasions in which a complex gerund can be parallel with an action noun, as is the case in Spoiler alert: if you click on the link the answer to an official question is revealed. this question, here. True, species is not an action noun. I am seeing quite a bit of confusion about gerunds and parallelism, though. I think the best way to understand how SC works is to study official examples. So I found some.

No. Answer B is not parallel. I hope that helps.

P.S. Arvind42 - At times the only kind of noun that exists for that word is an ING noun. Words such as running, writing, or painting (i.e. a picture that you hang on a wall) ARE the only nouns. In those cases, parallelism is not an issue. Beneath the spoiler is a question in which one noun ending in _ING is parallel to two other nouns that do not end in _ING because the _ING noun does not have any other form. Spoiler alert - clicking on the link gives the answer to a question. In this official question, here, cultivation, harvesting, and exploitation are parallel. There is no such noun as harvestation or harvestature. .

Will2020 · Answer

BrightOutlookJenn GMATNinja DmitryFarber VeritasKarishma About (E), there is a lack of parallelism, right? I mean, "...threat to native species of plants and animals as well as to maintaining biologically diverse ecosystems..." tks!

KarishmaB · Answer

Yes, you should use noun form "maintenance" since "native species" is a noun.

Will2020 · Answer

Hi VeritasKarishma ! What is the issue in (E) regarding the modifier "after losing their habitat"? Tks!

KarishmaB · Answer

'Habitat loss' is the first threat and 'invasive plants' the second.

So the sentence should read "...invasive plants are the second most serious threat, after habitat loss,..." to show that the first one is habitat loss. This relation is lost if "after habitat loss" comes later. 
Also, it needs to be in noun form "habitat loss" to maintain parallelism.

sm1510 · Answer

Question appeared in GMAT Prep

Bunuel · Answer

_______________________
Added the tag. Thank you!

AwesomeYao · Answer

According to some botanists, invasive plants are the second most serious threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems.

Test Points: Parallelism

A. threat, after habitat loss, to native species of plants and animals and to the maintenance of biologically diverse ecosystems 
B. threat, after habitat loss, to native species of plants and animals and for maintaining biologically diverse ecosystems  ("to native species of...” is a preposition phrase, but "for maintaining...“ is a verb phrase. Hence, the overall stucture does not comply with parallelism) 
C. threat, after losing their habitat, to native species of plants and animals and also to maintenance of biologically diverse ecosystems ( ”after losing...“ distorts the original meaning )
D. threat to native species of plants and animals and for maintaining biologically diverse ecosystems, after habitat loss  ("to native species of...” is a preposition phrase, but "for maintaining...“ is a verb phrase. Hence, the overall stucture does not comply with parallelism.) 
E. threat to native species of plants and animals as well as to maintaining biologically diverse ecosystems, after losing their habitat. (same logic as B)

ExpertsGlobal5 · Answer

Dear Friends,

Here is a detailed explanation to this question-

Meaning is crucial to solving this problem: 
Understanding the intended meaning is key to solving this question; the intended meaning of this sentence is that invasive plants are the second most serious threat to native species of plants and animals and are the second most serious threat to the maintenance of biologically diverse ecosystems.

Concepts tested here: Meaning + Comparisons

• Comparisons can only be made between similar things.

A:   Correct.  This answer choice uses the phrase "to the maintenance of biologically diverse ecosystems", conveying the intended meaning - that invasive plants are the second most serious threat to native species of plants and animals and   are also the second most serious threat   to the maintenance of biologically diverse ecosystems. Further, Option A correctly compares the noun phrase "invasive" plants with the noun phrase "habitat loss". Additionally, Option A is free of any awkwardness or redundancy.

B:  This answer choice alters the meaning of the sentence through the phrase "for maintaining biologically diverse ecosystems"; the construction of this phrase illogically implies that invasive plants are the second most serious threat to native species of plants and animals   because they maintain   biologically diverse ecosystems; the intended meaning is that invasive plants are the second most serious threat to native species of plants and animals and   are also the second most serious threat   to the maintenance of biologically diverse ecosystems.

C:  This answer choice incorrectly compares the noun phrase "invasive plants" to the verb phrase "losing their habitat"; remember, comparisons can only be made between similar things. Further, Option C uses the needlessly wordy phrase "and also", leading to awkwardness and redundancy.

D:  This answer choice alters the meaning of the sentence through the phrase "for maintaining biologically diverse ecosystems"; the construction of this phrase illogically implies that invasive plants are the second most serious threat to native species of plants and animals   because they maintain   biologically diverse ecosystems; the intended meaning is that invasive plants are the second most serious threat to native species of plants and animals and   are also the second most serious threat   to the maintenance of biologically diverse ecosystems.

E:  This answer choice incorrectly compares the noun phrase "invasive plants" to the verb phrase "losing their habitat"; remember, comparisons can only be made between similar things. Further, Option E uses the needlessly wordy phrase "as well as", leading to awkwardness and redundancy.

Hence, A is the best answer choice.

All the best!
Experts' Global Team

According to some botanists, invasive plants are the second

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According to some botanists, invasive plants are the second

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