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23 Apr 2020, 01:52
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A
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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.
Krishh9119
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23 Apr 2020, 03:31
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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?
Discrepancy: the lack of parasites in stingrays is an indicator that the ecosystem in which the stingrays live is under environmental stress such as pollution.
We need an answer that tells us pollution is the reason behind lack of parasite.
(A) During part of their life cycles, the parasites of stingrays require as hosts shrimp or oysters, which are environmentally vulnerable organisms.
parasites' food=shrimp or oysters
But shrimp or oysters are environmentally vulnerable organisms.
So, pollution reduces 'parasites' food' , which in turn decreases parasites in stingrays.
(B) A stingray is a free-ranging predator that feeds on smaller organisms but has few predators itself.
Out of Scope.
(C) A parasite drains part of the vitality of its host by drawing nourishment from the host.
Out Of Scope.
(D) An ecosystem can be considered stressed if only a few species of very simple organisms can live there.
Irrelevant
(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.
Irrelevant.
A is our answer.
Which one of the following, if true, most helps to reconcile the discrepancy indicated above?
Discrepancy: the lack of parasites in stingrays is an indicator that the ecosystem in which the stingrays live is under environmental stress such as pollution.
We need an answer that tells us pollution is the reason behind lack of parasite.
(A) During part of their life cycles, the parasites of stingrays require as hosts shrimp or oysters, which are environmentally vulnerable organisms.
parasites' food=shrimp or oysters
But shrimp or oysters are environmentally vulnerable organisms.
So, pollution reduces 'parasites' food' , which in turn decreases parasites in stingrays.
(B) A stingray is a free-ranging predator that feeds on smaller organisms but has few predators itself.
Out of Scope.
(C) A parasite drains part of the vitality of its host by drawing nourishment from the host.
Out Of Scope.
(D) An ecosystem can be considered stressed if only a few species of very simple organisms can live there.
Irrelevant
(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.
Irrelevant.
A is our answer.
globaldesi
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23 Apr 2020, 14:03
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IMO D
(D) An ecosystem can be considered stressed if only a few species of very simple organisms can live there.
since parasites are a simple living organism , having a lack of such indicates that enviroment is not able to sustain a lot of parasites.
Thus D helps resolve the depenency
(D) An ecosystem can be considered stressed if only a few species of very simple organisms can live there.
since parasites are a simple living organism , having a lack of such indicates that enviroment is not able to sustain a lot of parasites.
Thus D helps resolve the depenency
