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Mercury is only present in small amounts in marine ecosystems, yet it

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Mercury is only present in small amounts in marine ecosystems, yet it  [#permalink]

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New post 04 Aug 2018, 07:01
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Mercury is only present in small amounts in marine ecosystems, yet it still presents a potential danger to fish eaters. Species of fish that are relatively higher on the food chain contain higher concentrations of mercury in their tissues than do smaller fish. Mercury is efficiently absorbed, but only very slowly excreted, by tiny organisms such as algae and phytoplankton. When these small organisms are consumed by a predator, and those predators are consumed by other predators, the mercury level accumulates. In order to reduce the natural occurrence of mercury biomagnification, fisheries could study measures of plankton density, which are relatively easy and inexpensive to estimate. Such measurements have been shown to be effective predictors of mercury biomagnification, wherein high levels of density positively correlate with high levels of mercury concentration.

Many larger fishing companies, in order to assuage consumer concerns, have combined their marine fishing efforts with farm fishing, which involves raising fish commercially in tanks or enclosures with no exposure to mercury or other chemicals that are susceptible to biomagnification. Another advantage of fish farming and other forms of aquaculture is that it counteracts the overfishing that has destroyed marine habitats in many ares while allowing commercial fishermen to keep up with the increasing market demand for fish.

Which of the following, if true, most strongly supports the prediction that fisheries that measure marine plankton density would reduce the amount of mercury in the fish they obtain from the ocean?

(A) Fish that live in areas of high plankton density are easier to obtain.
(B) Small-scale coastal fishermen have reported lower levels of mercury in fish obtained from areas of low plankton density.
(C) High plankton density is also correlated with high mercury levels in fish farm tanks.
(D) Consumer concerns regarding mercury levels in fish have been greatly reduced due to the increase in fish farming.
(E) Fishing companies that use farm fishing raise fish that live in tanks with high levels of plankton but have no mercury in their tissues.


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Re: Mercury is only present in small amounts in marine ecosystems, yet it  [#permalink]

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New post 04 Aug 2018, 07:03
Why the answer option E is wrong?
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Re: Mercury is only present in small amounts in marine ecosystems, yet it  [#permalink]

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New post 07 Aug 2018, 16:54
AD2GMAT wrote:
Why the answer option E is wrong?


Hi AD2GMAT,

Here's my take on this question -the prompt asks, which of these most strongly supports the prediction that fisheries that measure marine plankton density would reduce the amount of mercury in the fish they obtain from the ocean? Have a careful read at this one - It talks only about fishes from ocean. Also, from the passage, reduction of the natural occurrence of mercury biomagnification is taken in to account, how it's done we are not told. It only talks about it can be done.

For these reasons, option E is incorrect.

Hope this clears.
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Re: Mercury is only present in small amounts in marine ecosystems, yet it  [#permalink]

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New post 07 Aug 2018, 16:55
I have posted my solution, but I am not sure if its incorrect for correct reasons. Can some one please look into this?

Thanks
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Mercury is only present in small amounts in marine ecosystems, yet it  [#permalink]

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New post 07 Aug 2018, 18:19
Quote:
In order to reduce the natural occurrence of mercury biomagnification, fisheries could study measures of plankton density, which are relatively easy and inexpensive to estimate. Such measurements have been shown to be effective predictors of mercury biomagnification, wherein high levels of density positively correlate with high levels of mercury concentration.


AD2GMAT

The questions is related to lines stated above.

The authors prediction is that high levels of density plankton positively correlate with high levels of mercury concentration.

(A) Fish that live in areas of high plankton density are easier to obtain.

Option A : Talks about fish that live in areas of high plankton density but doesn't mention anything about mercury levels INCORRECT

(B) Small-scale coastal fishermen have reported lower levels of mercury in fish obtained from areas of low plankton density.

This option specifies a correlation between plankton density and mercury concentration which aligns with authors prediction. Hence this option strengthens authors prediction

(C) High plankton density is also correlated with high mercury levels in fish farm tanks.

The author talks about the fish obtained from ocean. This option is unrelated INCORRECT

(D) Consumer concerns regarding mercury levels in fish have been greatly reduced due to the increase in fish farming.

unrelated to the relation between plankton density and mercury levels INCORRECT

(E) Fishing companies that use farm fishing raise fish that live in tanks with high levels of plankton but have no mercury in their tissues.

The question is related to the fish obtained from the ocean. INCORRECT

Hence option B
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Mercury is only present in small amounts in marine ecosystems, yet it &nbs [#permalink] 07 Aug 2018, 18:19
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