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tricky 1

by geet » Fri Jul 03, 2009 8:42 pm
A stingray without parasites is healthier than it would be if it had parasites. Nevertheless, the lack of parasites in stingrays is an indicator that the ecosystem in which the stingrays live is under environmental stress such as pollution.
Which one of the following, if true, most helps to reconcile the discrepancy indicated above?
(A) During part of their life cycles, the parasites of stingrays require as hosts shrimp or oysters, which are environmentally vulnerable organisms.
(B) A stingray is a free-ranging predator that feeds on smaller organisms but has few predators itself.
(C) A parasite drains part of the vitality of its host by drawing nourishment from the host.
(D) An ecosystem can be considered stressed if only a few species of very simple organisms can live there.
(E) Since the life of parasites depends on that of their host, they need to live without killing their host or else to reproduce and infect other individuals before their own host dies.

OA is A...remember to explain the logic!!!
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by cramya » Fri Jul 03, 2009 9:57 pm
Stingray minus Parasites=> Healthier

However lack of parasites in stingrays implies an ecosystem that is stressed by factors such as pollution

What A is saying is Shrimps and Oysters cannot survive in an ecosystem that is stressed (since they are environmentally vulnerable organisms) and parasites during their life cycle migrate to these hosts from the stingrays and during this period the sting rays are healthier in a ecosystem stressed by factors such as pollution

Atleast this is the best I could explain.

Regards,
CR
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Re: tricky 1

by ssmiles08 » Sat Jul 04, 2009 5:10 pm
geet wrote:A stingray without parasites is healthier than it would be if it had parasites. Nevertheless, the lack of parasites in stingrays is an indicator that the ecosystem in which the stingrays live is under environmental stress such as pollution.
Which one of the following, if true, most helps to reconcile the discrepancy indicated above?
(A) During part of their life cycles, the parasites of stingrays require as hosts shrimp or oysters, which are environmentally vulnerable organisms.
(B) A stingray is a free-ranging predator that feeds on smaller organisms but has few predators itself.
(C) A parasite drains part of the vitality of its host by drawing nourishment from the host.
(D) An ecosystem can be considered stressed if only a few species of very simple organisms can live there.
(E) Since the life of parasites depends on that of their host, they need to live without k!II!ng their host or else to reproduce and infect other individuals before their own host dies.

OA is A...remember to explain the logic!!!
To figure out the answer to this problem, you have to look at the reasoning the author is making for arriving at his conclusion. His conclusion is that if there are no parasites on the sting ray, then it is under environmental stress.

To reconcile his discrepency, we have to prove that environmental stress is indeed the reason why stingrays do not have parasites.

By stating shrimps and oysters are environmentally vulnerable organisms and they are parasites of the sting ray (A), we can provide enough evidence that a stingray without any parasites is living in an "environmentally stressed" situation.
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Re: tricky 1

by geet » Sat Jul 04, 2009 8:25 pm
To figure out the answer to this problem, you have to look at the reasoning the author is making for arriving at his conclusion. His conclusion is that if there are no parasites on the sting ray, then it is under environmental stress.

To reconcile his discrepency, we have to prove that environmental stress is indeed the reason why stingrays do not have parasites.

By stating shrimps and oysters are environmentally vulnerable organisms and they are parasites of the sting ray (A), we can provide enough evidence that a stingray without any parasites is living in an "environmentally stressed" situation.
ok,i do understand that if there are no parasites on the stingray, then it will live under environmental stress, but how come pollution came in to play, i mean yes if parasite make shrimps and oysters their host then environment will come under stress but stress of pollution?? i didn't get that!!
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Re: tricky 1

by ssmiles08 » Sun Jul 05, 2009 4:57 am
geet wrote: ok,i do understand that if there are no parasites on the stingray, then it will live under environmental stress, but how come pollution came in to play, i mean yes if parasite make shrimps and oysters their host then environment will come under stress but stress of pollution?? i didn't get that!!
I don't think "pollution" has any effect on the stimulus directly. The author is just giving an example of what an 'environmental stress' would be.

it would probably be the same if he had said, "...is an indicator that the ecosystem in which the stingrays live is under environmental stress, for example pollution."

he could have substituted pollution with volcano eruption, or natural disaster or chemical hazards, it wouldn't matter. they are all a subcategory of environmental stress which affect the sting rays in some way.

-hope that makes sense.
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by khanshainur » Sun May 15, 2016 11:58 pm
I would go with option A as the correct option
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by Eric77Gorm » Mon May 16, 2016 12:04 am
I am leaning more towards A,
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