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Every year many people become ill because of airborne mold

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Re: CR Mold spores [#permalink] New post 01 Jul 2008, 21:19
OA is A
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Every year many people become ill because of airborne mold [#permalink] New post 13 Mar 2010, 15:52
Every year many people become ill because of airborne mold spores in their homes. After someone becomes ill, specialists are often hired to eradicate the mold. These specialists look in damp areas of the house, since mold is almost always found in places where there is substantial moisture. If one wishes to avoid mold poisoning, then, one should make sure to keep all internal plumbing in good condition to prevent leakage that could serve as a breeding ground for mold.

Which of the following is an assumption on which the argument depends?

1]Mold itself does not create moisture.
2]Most homeowners know enough about plumbing to determine whether theirs is in good condition.
3]Mold cannot grow in dry areas.
4]No varieties of mold are harmless.
5]Mold spores cannot be filtered from the air.
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Re: mold spores [#permalink] New post 18 Mar 2010, 18:58
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Hey All,

Even though the right answer was eventually arrived at here, there was enough confusion I thought it might be worth outlining. Let's do it.

Every year many people become ill because of airborne mold spores in their homes. After someone becomes ill, specialists are often hired to eradicate the mold. These specialists look in damp areas of the house, since mold is almost always found in places where there is substantial moisture. If one wishes to avoid mold poisoning, then, one should make sure to keep all internal plumbing in good condition to prevent leakage that could serve as a breeding ground for mold.

Conclusion: To avoid mold poisoning, keep plumbing in good condition.
Premises: Specialists check in damp areas of the house/mold is almost always in moist places
Assumption: Plumbing is the only thing that causes moisture.

Now I swear on a stack of bibles I wrote this assumption before looking at the answer choices. Think about it. The argument is airtight, other than this little issue. The conclusion involves plumbing, but that seems pretty specific, doesn't it? What about fixing the roof, so rain water can't get in? Truth is, there are plenty of ways moisture could get into the house.

As for a pattern, this is an eliminate alternate cause question. These are very common on the GMAT CR section, and there's a great thing to know about them: very often, when the question posits that A causes B, the assumption is that B doesn't cause A. It's called a causation/correlation mistake (we see two things happening, for example moisture and mold, and assume that moisture causes mold). Though sometimes the answer will just be any other old cause (like the leaky roof I suggested), very often it's just a reversal (mold might cause moisture). Be on the lookout!

1]Mold itself does not create moisture.
ANSWER: Uh-oh. Think about it. If mold DID create moisture, then it wouldn't be enough to check the plumbing, because the mold could be anywhere. This would explain why it's always found in moist places.

2]Most homeowners know enough about plumbing to determine whether theirs is in good condition.
PROBLEM: This is a tricky one. If the conclusion were, "Homeowners should thus have no problem finding mold on their own," this would be the assumption. But the conclusion is that plumbing needs to be kept in good condition. If you don't know, you'd just have to learn.

3]Mold cannot grow in dry areas.
PROBLEM: We don't need to assume this, because the conclusion is not that all mold will be eradicated if plumbing is checked. It's only that if one wishes to avoid mold, one should keep plumbing in check. Even if mold can grow in dry places, the facts point towards moisture being the most common place to find it, and thus the conclusion would still hold.

4]No varieties of mold are harmless.
PROBLEM: Not the issue. Even if some are harmless, some aren't.

5]Mold spores cannot be filtered from the air.
PROBLEM: This might suggest another way that mold poisoning can be avoided (some type of filtration system), but as the conclusion relates to actually getting rid of the mold where it comes from, this answer choice is out of scope.

Hope that helps!

-t
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Re: mold spores [#permalink] New post 06 Apr 2010, 11:02
Caught between A and C

The stem states,"..mold is almost always found in places where there is substantial moisture"

Going with A for this reason.OA pls.
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Re: mold spores [#permalink] New post 06 Apr 2010, 18:58
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Hey Kiski,

Also, always be aware of really strong statements. C says "Mold cannot grow in dry places". Would we need to assume that mold NEVER grows in dry places? If it happened one out of a million times, would that compromise our argument? Probably not. Always be wary of terms like "cannot", "never", and "always".

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Re: mold spores [#permalink] New post 01 Feb 2011, 07:32
One more remark why C is not correct:
If one looks at the last sentence of the original text there is written "as a breeding ground". But in C there is a word "grow".

In the original text it is given that the mold breeds in moisture but this statement does not negate that it cannot grow in dry places. Moreover, "to grow" and "to breed" are not of the same meaning. Here the original text does not give overtly or does not indicate strongly that the mold does not grow in dry places. This is why negating C does not destroy the original text at all. Hence one is inclined to check other ans. options.
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Re: mold spores [#permalink] New post 01 Feb 2011, 09:23
A. Relatively easy one. The argument has to presuppose that mold itself does not create moisture.
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Re: mold spores [#permalink] New post 27 Feb 2011, 04:13
feruz77 wrote:
One more remark why C is not correct:
If one looks at the last sentence of the original text there is written "as a breeding ground". But in C there is a word "grow".

In the original text it is given that the mold breeds in moisture but this statement does not negate that it cannot grow in dry places. Moreover, "to grow" and "to breed" are not of the same meaning. Here the original text does not give overtly or does not indicate strongly that the mold does not grow in dry places. This is why negating C does not destroy the original text at all. Hence one is inclined to check other ans. options.

i think differentiating between growing and breeding would be splitting hairs. as the premise already states that mold is almost always found in places where there is substantial moisture, being extreme (C) does not have to be true.

Tommy has a decent explanation above
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Re: mold spores [#permalink] New post 27 Feb 2011, 04:17
A true example of reversal in causality. That's what is being checked. A is clear.
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Re: mold spores [#permalink] New post 28 Feb 2011, 04:39
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A is the definite answer . The conclusion depends on the fact that moisture causes mold . The relationship is cause and effect.

If the cause effect relationship is reversed the argument loses ground.
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Every year many people become ill because of airborne mold [#permalink] New post 18 Jun 2011, 21:55
Every year many people become ill because of airborne mold spores in their homes. After someone becomes ill, specialists are often hired to eradicate the mold. These specialists look in damp areas of the house, since mold is almost always found in places where there is substantial moisture. If one wishes to avoid mold poisoning, then, one should make sure to keep all internal plumbing in good condition to prevent leakage that could serve as a breeding ground for mold.

Which of the following is an assumption on which the argument depends?

a)Mold itself does not create moisture.

b)Most homeowners know enough about plumbing to determine whether theirs is in good condition.

c)Mold cannot grow in dry areas.

d)No varieties of mold are harmless.

e)Mold spores cannot be filtered from the air.


Why is C wrong?

Last edited by siddhans on 19 Jun 2011, 13:25, edited 1 time in total.
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Re: Mould [#permalink] New post 19 Jun 2011, 07:07
Assumption : <b>Unstated</b> premise which links the stated premise with the conclusion.

The argument gives a cause effect reasoning,

Moisture causes mould.

Moisture is the cause, mould is the effect.

A supports this by saying that mould is not the cause of moisture (preventing Effect => Cause).

C is not correct, as it is already stated.(Mould is almost always found in places with moisture).


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Re: Mould CR [#permalink] New post 13 Sep 2011, 10:21
What about Choice B.

the main conclusion of this is:

to avoid this issue people should make sure their internal plumbing is in good condition

if we negate this:if people don't know enough about plumbing then the conclusion is lost..

thoughts please !!
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Re: Mould CR [#permalink] New post 13 Sep 2011, 10:26
thinking more about it i think A is indeed correct as i could hire a professional to make sure that my plumbing is in good condition !!

But if mold itself created more moisture then having plumbing in great condition would not help !!
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Re: Mould CR [#permalink] New post 13 Sep 2011, 10:44
siddhans wrote:
Why is C wrong?

Every year many people become ill because of airborne mold spores in their homes. After someone becomes ill, specialists are often hired to eradicate the mold. These specialists look in damp areas of the house, since mold is almost always found in places where there is substantial moisture. If one wishes to avoid mold poisoning, then, one should make sure to keep all internal plumbing in good condition to prevent leakage that could serve as a breeding ground for mold.

Which of the following is an assumption on which the argument depends?

a)Mold itself does not create moisture.

b)Most homeowners know enough about plumbing to determine whether theirs is in good condition.

c)Mold cannot grow in dry areas.

d)No varieties of mold are harmless.

e)Mold spores cannot be filtered from the air.


A&C are contenders.
Conclusion: If one wishes to avoid mold poisoning, then, one should make sure to keep all internal plumbing in good condition.
Negate A.. Mold itself creates moisture.
This weakens the conclusion: Even if plumbing is in good condition, mold can create moisture and thus mold poisoning can happen...

Negate C. Mold can grow in dry areas. Argument says that mold is mostly found in places where there is substantial moisture. Thus we know that mold can be found in other areas also (as mostly doesn't mean only). But the chances are less.. and thus argument survives...
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Every year many people become ill because of airborne mold [#permalink] New post 10 Mar 2012, 00:59
Every year many people become ill because of airborne mold spores in their homes. After someone becomes ill, specialists are often hired to eradicate the mold. These specialists look in damp areas of the house, since mold is almost always found in places where there is substantial moisture. If one wishes to avoid mold poisoning, then, one should make sure to keep all internal plumbing in good condition to prevent leakage that could serve as a breeding ground for mold.

Which of the following is an assumption on which the argument depends?

1]Mold itself does not create moisture.
2]Most homeowners know enough about plumbing to determine whether theirs is in good condition.
3]Mold cannot grow in dry areas.
4]No varieties of mold are harmless.
5]Mold spores cannot be filtered from the air.

can someone pl explain why E is not an assumption here..
the conclusion says - to avoid mold poisoning control moisture .... but what if i can avoid poising by filtering the air then i dont have to bother about the leaks
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Re: molds [#permalink] New post 10 Mar 2012, 02:03
The passage speaks about the relation between mold and moisture. Molds are found where moisture is. Even experts look for those wet spots to track molds. So it is advised for the inhabitants of the house to check their plumbing in a timely manner.


1]Mold itself does not create moisture.
2]Most homeowners know enough about plumbing to determine whether theirs is in good condition.
3]Mold cannot grow in dry areas. - No reference of dry areas - Incorrect
4]No varieties of mold are harmless. - Irrelevant information - Incorrect
5]Mold spores cannot be filtered from the air. - This talks about the alternative way of removing mold. - Incorrect

I chose B since it was advised for the people to check for plumbing.

Would like to know why the answer is A.
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Re: molds [#permalink] New post 10 Mar 2012, 03:12
gladiator999 wrote:
An easy Cr Ques.
Will go for A


Could you please explain E?
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Re: molds [#permalink] New post 10 Mar 2012, 20:53
devinawilliam83 wrote:
Every year many people become ill because of airborne mold spores in their homes. After someone becomes ill, specialists are often hired to eradicate the mold. These specialists look in damp areas of the house, since mold is almost always found in places where there is substantial moisture. If one wishes to avoid mold poisoning, then, one should make sure to keep all internal plumbing in good condition to prevent leakage that could serve as a breeding ground for mold.

Which of the following is an assumption on which the argument depends?

1]Mold itself does not create moisture.
2]Most homeowners know enough about plumbing to determine whether theirs is in good condition.
3]Mold cannot grow in dry areas.
4]No varieties of mold are harmless.
5]Mold spores cannot be filtered from the air.

can someone pl explain why E is not an assumption here..
the conclusion says - to avoid mold poisoning control moisture .... but what if i can avoid poising by filtering the air then i dont have to bother about the leaks


I agree with your point but the conclusion is not only the point you highlighted .... You are talking of something to reduce molds .. but the question asks the assumption taken in coming to the conclusion that we should prevent leakage to avoid molds ... Think of point 5 and the point I have highlighted ...

Assumption is that leakage doesnt need to be avoided at all.. may be molds are creating moisture themselves ...
Do i make sense?
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Re: molds [#permalink] New post 10 Mar 2012, 21:11
Guys, I'm locking this topic. This has been discussed in detail previously.

every-year-many-people-become-ill-because-of-airborne-mold-91389.html
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Re: molds   [#permalink] 10 Mar 2012, 21:11
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