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Re: The deep sea typically has a sparse fauna dominated by tiny worms and [#permalink]
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bacterial chemosynthesis, production of food by bacteria using energy derived from chemical changes

Which of the following can be inferred from the passage about the particulate matter that is carried down from the surface of the ocean?

(A) It is the basis of bacterial chemosynthesis in the vents.

Not totally true. later in the passage is said that it is partial

Quote:
This suggests that bacterial chemosynthesis is not a sufficient source of nutrition for these creatures.


(B) It may provide an important source of nutrition for vent faunas.

Most deep-sea faunas rely for food on particulate matter ultimately derived from photosynthesis, falling from above. The food supplies necessary to sustain the large vent communities, however, must be many times the ordinary fallout.

which means there are other factors that sustain the fauna.

(C) It may cause the internal temperature of the vents to change significantly.

Partially true.

(D) It is transported as large aggregates of particles.

Not stated directly in the passage or inferred.

(E) It contains hydrogen sulfide.

Not true. Hydrogen sulfide is a by-product of a process. The result. Per se the water does not contain it.

Hope this helps.

Regards.

PS: this is a very daunting passage yet it is 100% reliable.
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Re: The deep sea typically has a sparse fauna dominated by tiny worms and [#permalink]
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as6 wrote:
Can Some one please explain how the answer is B and why not E for last question ? The passage does not say anything about the importance of food.


as6 welcome to the club

Which of the following can be inferred from the passage about the particulate matter that is carried down from the surface of the ocean?


first find where we have the "particuate matter" in the entire para !!
"Most deep-sea faunas rely for food on particulate matter ultimately derived from photosynthesis, falling from above."

"Research has demonstrated that advective flow, which originates near the surface of the ocean where suspended particulate matter accumulates, transports some of that matter and water to the vents. Estimates suggest that for every cubic meter of vent discharge, 350 milligrams of particulate organic material would be advected into the vent area. Thus, for an average-sized vent, advection could provide more than 30 kilograms of potential food per day."

in the second para the author intoroduces 2 possible explanations for nutrition : chemo and advectio
in the same para we get the positives toads chemo
in the third para we get the limitations of chemo explanation : by stating the chemo is not an adquate explanayion and thus an adequate source of food
in the 4th para the author states : "advection is a more likely alternative food source. "
and what does advectio involve ?? usage of particulate matter !!! so isnt this indirectly suggesting us that "oarticaulate matter" may be an alternative souce of food !!

(A) It is the basis of bacterial chemosynthesis in the vents.
NO MENTION

(B) It may provide an important source of nutrition for vent faunas.
- CORRECT
(C) It may cause the internal temperature of the vents to change significantly.
- NO MENTION

(D) It is transported as large aggregates of particles.
- This was the second closest answer. As the 4th para states ": for every cubic meter of vent discharge, 350 milligrams of particulate organic material would be advected into the vent area. Thus, for an average-sized vent, advection could provide more than 30 kilograms of potential food per day. "
But the "large" aggregate was a throw in this !!! second best answer

(E) It contains hydrogen sulfide
- The huydro sulphide was a possibe explanation for " chemo" ...but we have no link between chemo and "particulate matter"
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Re: The deep sea typically has a sparse fauna dominated by tiny worms and [#permalink]
The information in the passage suggests that the majority of deep-sea faunas that live in nonvent habitats have which of the following characteristics?

(A) They do not normally feed on particles of food in the water.
(B) They are smaller than many vent faunas.
(C) They are predators.
(D) They derive nutrition from a chemosynthetic food source.
(E) They congregate around a single main food source.

Why ain't the answer c?
it's mentioned that animals feed on bacteria
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Re: The deep sea typically has a sparse fauna dominated by tiny worms and [#permalink]
Raj30 wrote:
The information in the passage suggests that the majority of deep-sea faunas that live in nonvent habitats have which of the following characteristics?

(A) They do not normally feed on particles of food in the water.
(B) They are smaller than many vent faunas.
(C) They are predators.
(D) They derive nutrition from a chemosynthetic food source.
(E) They congregate around a single main food source.

Why ain't the answer c?
it's mentioned that animals feed on bacteria


The information regarding deep-sea faunas is mentioned in first passage. And it is nowhere mentioned that they are the predators.
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Re: The deep sea typically has a sparse fauna dominated by tiny worms and [#permalink]
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Why is C the ans for question 1?

(C) Do bacteria live in the vent water of smokers? - "Another difficulty is that similarly dense populations of large deep-sea animals have been found in the proximity of "smokers" -vents where water emerges at temperatures up to 350° C. No bacteria can survive such heat, and no bacteria were found there Unless smokers are consistently located near more"

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Re: The deep sea typically has a sparse fauna dominated by tiny worms and [#permalink]
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neetib wrote:
Please explain ques 4 ?


Here is the relevant portion: "There are, however, certain difficulties with this interpretation. For example, some of the large sedentary organisms associated with vents are also found at ordinary deep-sea temperatures many meters from the nearest hydrothermal sources."

Choice A, then, is the answer: some animals found near the vents are also found elsewhere. If chemosynthesis near the vents supposedly provides all the food, then how do these other animals not near the vents find food?
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Re: The deep sea typically has a sparse fauna dominated by tiny worms and [#permalink]
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Re: The deep sea typically has a sparse fauna dominated by tiny worms and [#permalink]
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