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The importance of the ozone layer to terrestrial animals is

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The importance of the ozone layer to terrestrial animals is [#permalink] New post 10 May 2011, 10:46
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Question Stats:

78% (02:18) correct 22% (01:31) wrong based on 193 sessions
The importance of the ozone layer to terrestrial animals is that it entirely filters out some wavelengths of light but lets others through. Holes in the ozone layer and the dangers associated with these holes are well documented. However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species.

Which one of the following is most strongly supported by the statements above, if they are true?

A. All wavelengths of sunlight that can cause eye damage are filtered out by the ozone layer where it is intact.
B. Few species of animals live on a part of the earth’s surface that is not threatened by holes in the ozone layer.
C. Some species of animals have eyes that will not suffer any damage when exposed to unfiltered sunlight.
D. A single wavelength of sunlight can cause severe damage to the eyes of most species of animals.
E. Some wavelengths of sunlight that cause eye damage are more likely to reach the earth’s surface where there are holes in the ozone layer than where there are not.

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C is said to be wrong because "many species" may mean "all species". Please explain.

If I say I have 10 balls and many balls are red. Can't I be sure that some will not be red?
[Reveal] Spoiler: OA
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Re: Can "many" include "all"? (Source: PowerScore) [#permalink] New post 10 May 2011, 12:46
I will go with E for this.

Question is asking what of the following is supported by the argument.
3 is - B,C and D are talking out of the way. A is not supporting the argument.
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Re: Can "many" include "all"? (Source: PowerScore) [#permalink] New post 10 May 2011, 13:57
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+1 E

Yes, "all" MAY include "many".
For example, if you have 100 balls, "many" could be 50 or 100 balls. In both cases, they are a lot! It is an ambiguous term. In this sense, you must be careful of what "many" could mean.

However, I think that " many " is not critical to eliminate C. "Any" is most important in that choice.

I think I deserve kudos 8-)
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Re: Can "many" include "all"? (Source: PowerScore) [#permalink] New post 10 May 2011, 21:16
metallicafan wrote:
+1 E

Yes, "all" MAY include "many".
For example, if you have 100 balls, "many" could be 50 or 100 balls. In both cases, they are a lot! It is an ambiguous term. In this sense, you must be careful of what "many" could mean.

However, I think that " many " is not critical to eliminate C. "Any" is most important in that choice.

I think I deserve kudos 8-)


Thanks a lot. I overlooked the "any" :shock:

Kudos to you! :-D
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Re: Can "many" include "all"? (Source: PowerScore) [#permalink] New post 10 May 2011, 23:20
There is a gap in reasoning of how the lights may effect the eye sight of some species.
Hence a supporter answer choice is needed here which fills the gap.

Paraphrase : how the regions where there are holes are more problematic than regions where there are no holes in Ozone layer ?
Answer to this will suffice the argument.

Between D and E,

E gives a clear answer. Also negating E will make the conclusion falls too.
Hence E is an assumption answer choice too.
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Re: The importance of the ozone layer to terrestrial animals is [#permalink] New post 08 Nov 2013, 04:40
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Re: The importance of the ozone layer to terrestrial animals is [#permalink] New post 10 Nov 2013, 09:10
The key thing here to note is the phrase "severe eye damage"

The importance of the ozone layer to terrestrial animals is that it entirely filters out some wavelengths of light but lets others through. Holes in the ozone layer and the dangers associated with these holes are well documented. However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species.

Which one of the following is most strongly supported by the statements above, if they are true?

A. All wavelengths of sunlight that can cause eye damage are filtered out by the ozone layer where it is intact.Close but flawed.No one said that other wavelengths cannot cause damage, Its just that they can't cause severe damage.So all the wavelengths need not be filtered out.
B. Few species of animals live on a part of the earth’s surface that is not threatened by holes in the ozone layer.Can't say. Maybe more live maybe not
C. Some species of animals have eyes that will not suffer any damage when exposed to unfiltered sunlight.Is not supported by above statements
D. A single wavelength of sunlight can cause severe damage to the eyes of most species of animals.Not supported
E. Some wavelengths of sunlight that cause eye damage are more likely to reach the earth’s surface where there are holes in the ozone layer than where there are not.
True, ozone filters some of the wavelengths, so the rays are more likely to reach the surface of earth where there are holes in the surface of earth.
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Re: The importance of the ozone layer to terrestrial animals is [#permalink] New post 11 Nov 2013, 05:52
ramannanda9 wrote:
The key thing here to note is the phrase "severe eye damage"

The importance of the ozone layer to terrestrial animals is that it entirely filters out some wavelengths of light but lets others through. Holes in the ozone layer and the dangers associated with these holes are well documented. However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species.

Which one of the following is most strongly supported by the statements above, if they are true?

A. All wavelengths of sunlight that can cause eye damage are filtered out by the ozone layer where it is intact.Close but flawed.No one said that other wavelengths cannot cause damage, Its just that they can't cause severe damage.So all the wavelengths need not be filtered out.
B. Few species of animals live on a part of the earth’s surface that is not threatened by holes in the ozone layer.Can't say. Maybe more live maybe not
C. Some species of animals have eyes that will not suffer any damage when exposed to unfiltered sunlight.Is not supported by above statements
D. A single wavelength of sunlight can cause severe damage to the eyes of most species of animals.Not supported
E. Some wavelengths of sunlight that cause eye damage are more likely to reach the earth’s surface where there are holes in the ozone layer than where there are not.
True, ozone filters some of the wavelengths, so the rays are more likely to reach the surface of earth where there are holes in the surface of earth.


We have this in the stem:
" However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species."

Why can't we infer from this that C is the right answer?
Clearly we are told that there will be damage to MOST species.
This means that SOME will not be hurt....
?
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Re: The importance of the ozone layer to terrestrial animals is [#permalink] New post 16 Nov 2013, 05:12
ronr34 wrote:
ramannanda9 wrote:
The key thing here to note is the phrase "severe eye damage"

The importance of the ozone layer to terrestrial animals is that it entirely filters out some wavelengths of light but lets others through. Holes in the ozone layer and the dangers associated with these holes are well documented. However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species.

Which one of the following is most strongly supported by the statements above, if they are true?

A. All wavelengths of sunlight that can cause eye damage are filtered out by the ozone layer where it is intact.Close but flawed.No one said that other wavelengths cannot cause damage, Its just that they can't cause severe damage.So all the wavelengths need not be filtered out.
B. Few species of animals live on a part of the earth’s surface that is not threatened by holes in the ozone layer.Can't say. Maybe more live maybe not
C. Some species of animals have eyes that will not suffer any damage when exposed to unfiltered sunlight.Is not supported by above statements
D. A single wavelength of sunlight can cause severe damage to the eyes of most species of animals.Not supported
E. Some wavelengths of sunlight that cause eye damage are more likely to reach the earth’s surface where there are holes in the ozone layer than where there are not.
True, ozone filters some of the wavelengths, so the rays are more likely to reach the surface of earth where there are holes in the surface of earth.


We have this in the stem:
" However, one danger that has not been given sufficient attention is that these holes could lead to severe eye damage for animals of many species."

Why can't we infer from this that C is the right answer?
Clearly we are told that there will be damage to MOST species.
This means that SOME will not be hurt....
?


Precisely because the argument says severe damage and the option C says no damage. But there can be minor damage even of there is no severe damage.

Hope it is clear.
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Re: The importance of the ozone layer to terrestrial animals is   [#permalink] 16 Nov 2013, 05:12
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