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desert locations with access to seawater, a new greenhouse

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desert locations with access to seawater, a new greenhouse [#permalink] New post 11 Feb 2016, 07:08
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Question Stats:

51% (02:59) correct 48% (02:57) wrong based on 97 sessions
For hot desert locations with access to seawater, a new greenhouse design generates freshwater and cool air. Oriented to the prevailing wind, the front wall of perforated cardboard, moistened and cooled by a trickle of seawater pumped in, cools and moistens hot air blowing in. This cool, humidified air accelerates plant growth; little water evaporates from leaves. Though greenhouses normally capture the heat of sunlight, a double-layered roof, the inner layer coated to reflect infrared light outward, allows visible sunlight in but traps solar heat between the two layers. This heated air, drawn down from the roof, then mixes with the greenhouse air as it reaches a second seawater-moistened cardboard wall at the back of the greenhouse. There the air absorbs more moisture, which then condenses on a metal wall cooled by seawater, and thus distilled water for irrigating the plants collects.
For the following question, consider each of the choices separately and select all that apply.

3. It can be inferred that the process described in the passage makes use of which of
the following?

A The tendency of hot air to rise
B The directional movement of wind
C The temperature differential between the sea and the desert

[Reveal] Spoiler: OA
Choices B and C


For the following question, consider each of the choices separately and select all that apply.

4. It can be inferred that the greenhouse roof is designed to allow for which of the following?

A The avoidance of intense solar heat inside the greenhouse
B The entry of sunlight into the greenhouse to make the plants grow
C The mixture of heated air with greenhouse air to enhance the collection of moisture

[Reveal] Spoiler: OA
Choices A, B and C



Practice Questions
Question: 3,4
Page: 72
Difficulty: hard

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Retired Moderator
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Kudos [?]: 2977 [3] , given: 394

Re: desert locations with access to seawater, a new greenhouse [#permalink] New post 11 Feb 2016, 07:16
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Expert's post

Explanation



3.

Choices B and C are correct. This question asks the reader which of the three phenomena listed in the answer choices is used in the process described in the passage.

Choice A is incorrect: the passage does not indicate that the tendency of hot air to rise is used in the process, and in fact says that heated air is drawn down, not up, as part of the greenhouse design.

Choice B is correct: the second sentence describes the orientation of a perforated cardboard wall toward the prevailing wind so that hot air blows in and is moistened.

Choice C is correct: the passage describes the use of seawater to cool hot desert air and to provide moisture that is absorbed by heated air and then condensed on a seawater-cooled surface for the purpose of irrigating the plants.


4.

All three choices are correct. This question asks the reader which of the three effects listed in the answer choices are intended as part of the design of the greenhouse roof.

Choice A is correct: the purpose of the double-layered roof is to trap solar heat before it gets inside the greenhouse proper.
Choice B is correct: the coating on the inner layer of the roof allows visible sunlight into the greenhouse.
Choice C is correct: the last two sentences of the passage describe how heated air from the roof is drawn down to mix with greenhouse air, resulting in the collection of distilled water for irrigation purposes.
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Re: desert locations with access to seawater, a new greenhouse [#permalink] New post 06 Nov 2019, 13:14
sandy wrote:

Explanation



3.

Choices B and C are correct. This question asks the reader which of the three phenomena listed in the answer choices is used in the process described in the passage.

Choice A is incorrect: the passage does not indicate that the tendency of hot air to rise is used in the process, and in fact says that heated air is drawn down, not up, as part of the greenhouse design.

Choice B is correct: the second sentence describes the orientation of a perforated cardboard wall toward the prevailing wind so that hot air blows in and is moistened.

Choice C is correct: the passage describes the use of seawater to cool hot desert air and to provide moisture that is absorbed by heated air and then condensed on a seawater-cooled surface for the purpose of irrigating the plants.


4.

All three choices are correct. This question asks the reader which of the three effects listed in the answer choices are intended as part of the design of the greenhouse roof.

Choice A is correct: the purpose of the double-layered roof is to trap solar heat before it gets inside the greenhouse proper.
Choice B is correct: the coating on the inner layer of the roof allows visible sunlight into the greenhouse.
Choice C is correct: the last two sentences of the passage describe how heated air from the roof is drawn down to mix with greenhouse air, resulting in the collection of distilled water for irrigation purposes.




For hot desert locations with access to seawater, a new greenhouse design generates freshwater and cool air. Oriented to the prevailing wind, the front wall of perforated cardboard, moistened and cooled by a trickle of seawater pumped in, cools and moistens hot air blowing in. This cool, humidified air accelerates plant growth; little water evaporates from leaves. Though greenhouses normally capture the heat of sunlight, a double-layered roof, the inner layer coated to reflect infrared light outward, allows visible sunlight in but traps solar heat between the two layers. This heated air, drawn down from the roof, then mixes with the greenhouse air as it reaches a second seawater-moistened cardboard wall at the back of the greenhouse. There the air absorbs more moisture, which then condenses on a metal wall cooled by seawater, and thus distilled water for irrigating the plants collects.

is not this means that the hot air is raised up? for question
3(a)
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Re: desert locations with access to seawater, a new greenhouse [#permalink] New post 27 Apr 2020, 13:41
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Question no 4 is bit weird in a way it is constructed.
The questions asks that the greenhouse roof is built "to allow" for which of the following? And the answer for A is to allow the avoidance of the intense heat, I was confused by this but now that I write it , I think it does make sense but still sounds weird in a way it was framed
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Re: desert locations with access to seawater, a new greenhouse [#permalink] New post 14 May 2020, 01:29
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sandy wrote:
For hot desert locations with access to seawater, a new greenhouse design generates freshwater and cool air. Oriented to the prevailing wind, the front wall of perforated cardboard, moistened and cooled by a trickle of seawater pumped in, cools and moistens hot air blowing in. This cool, humidified air accelerates plant growth; little water evaporates from leaves. Though greenhouses normally capture the heat of sunlight, a double-layered roof, the inner layer coated to reflect infrared light outward, allows visible sunlight in but traps solar heat between the two layers. This heated air, drawn down from the roof, then mixes with the greenhouse air as it reaches a second seawater-moistened cardboard wall at the back of the greenhouse. There the air absorbs more moisture, which then condenses on a metal wall cooled by seawater, and thus distilled water for irrigating the plants collects.
For the following question, consider each of the choices separately and select all that apply.

3. It can be inferred that the process described in the passage makes use of which of
the following?

A The tendency of hot air to rise
B The directional movement of wind
C The temperature differential between the sea and the desert

[Reveal] Spoiler: OA
Choices B and C


For the following question, consider each of the choices separately and select all that apply.

4. It can be inferred that the greenhouse roof is designed to allow for which of the following?

A The avoidance of intense solar heat inside the greenhouse
B The entry of sunlight into the greenhouse to make the plants grow
C The mixture of heated air with greenhouse air to enhance the collection of moisture

[Reveal] Spoiler: OA
Choices A, B and C



Practice Questions
Question: 3,4
Page: 72
Difficulty: hard


This is a very clear and easily "drawable" passage. One can really see the entire thing while reading it, thereby easing choosing the answer choices

Attacking the first question
A-->Well yes it is true that hot air rises, yet is it specified in the passage?TBH not, and this is a classical trick that one would be able to fall into with GRE passages and especially deceptive answer choices. There A is INCORRECT
B--> well in the passage it is specified with the following sentence "Oriented to the prevailing wind, the front wall of perforated cardboard, moistened and cooled by a trickle of seawater pumped in, cools and moistens hot air blowing in." So here we are able to clearly discern that the wind's directional movement is at this cardboard wall of some sort. Basically the wind blows at the wall, since the wall positioned in such a way to catch those wafts. CORRECT
C-->We have this stressed throughout the entire passage that the seawater is cooling the greenhouse. CORRECT

Attacking the second question:
A-->we have this clearly stated in the the following sentence "Though greenhouses normally capture the heat of sunlight, a double-layered roof, the inner layer coated to reflect infrared light outward, allows visible sunlight in but traps solar heat between the two layers" The part that says traps solar heat between the two layers is the thing we were looking for CORRECT
B-->again looking at the aforementioned sentence, we can see "that allows visible sunlight", which we are able to conclude is "of course" beneficial for the plants from the passage is a result of the rooftop CORRECT
C--->Looking at this one we are able to conclude that without the warm air that is derived from the rooftop aids the process of condensation. In the following sentence we are able to determine that after it mixes there is more condensation at the location then it was previously "There the air absorbs more moisture, which then condenses on a metal wall cooled by seawater, and thus distilled water for irrigating the plants collects."
How I would interpret it, were it that we wouldn'T have this effect, there would be condensation, yet less. Thereby this answer choice clearly states that the rooftop is designed to aid the process of amplifying the condensation process. CORRECT
Re: desert locations with access to seawater, a new greenhouse   [#permalink] 14 May 2020, 01:29
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