Comprehension
Scientists recently discovered that Emperor Penguins—one of Antarctica’s most celebrated species—employ a particularly unusual technique for surviving the daily chill. As detailed in an article published today in the journal Biology Letters, the birds minimize heat loss by keeping the outer surface of their plumage below the temperature of the surrounding air. At the same time, the penguins’ thick plumage insulates their body and keeps it toasty. . . .
The researchers analyzed thermographic images . . . taken over roughly a month during June 2008. During that period, the average air temperature was 0.32 degrees Fahrenheit. At the same time, the majority of the plumage covering the penguins’ bodies was even colder: the surface of their warmest body part, their feet, was an average 1.76 degrees Fahrenheit, but the plumage on their heads, chests and backs were -1.84, -7.24 and -9.76 degrees Fahrenheit respectively. Overall, nearly the entire outer surface of the penguins’ bodies was below freezing at all times, except for their eyes and beaks. The scientists also used a computer simulation to determine how much heat was lost or gained from each part of the body—and discovered that by keeping their outer surface below air temperature, the birds might paradoxically be able to draw very slight amounts of heat from the air around them. The key to their trick is the difference between two different types of heat transfer: radiation and convection.
The penguins do lose internal body heat to the surrounding air through thermal radiation, just as our bodies do on a cold day. Because their bodies (but not surface plumage) are warmer than the surrounding air, heat gradually radiates outward over time, moving from a warmer material to a colder one. To maintain body temperature while losing heat, penguins, like all warm-blooded animals, rely on the metabolism of food. The penguins, though, have an additional strategy. Since their outer plumage is even colder than the air, the simulation showed that they might gain back a little of this heat through thermal convection—the transfer of heat via the movement of a fluid (in this case, the air). As the cold Antarctic air cycles around their bodies, slightly warmer air comes into contact with the plumage and donates minute amounts of heat back to the penguins, then cycles away at a slightly colder temperature.
Most of this heat, the researchers note, probably doesn’t make it all the way through the plumage and back to the penguins’ bodies, but it could make a slight difference. At the very least, the method by which a penguin’s plumage wicks heat from the bitterly cold air that surrounds it helps to cancel out some of the heat that’s radiating from its interior. And given the Emperors’ unusually demanding breeding cycle, every bit of warmth counts. . . . Since [penguins trek as far as 75 miles to the coast to breed and male penguins] don’t eat anything during [the incubation period of 64 days], conserving calories by giving up as little heat as possible is absolutely crucial.
The researchers analyzed thermographic images . . . taken over roughly a month during June 2008. During that period, the average air temperature was 0.32 degrees Fahrenheit. At the same time, the majority of the plumage covering the penguins’ bodies was even colder: the surface of their warmest body part, their feet, was an average 1.76 degrees Fahrenheit, but the plumage on their heads, chests and backs were -1.84, -7.24 and -9.76 degrees Fahrenheit respectively. Overall, nearly the entire outer surface of the penguins’ bodies was below freezing at all times, except for their eyes and beaks. The scientists also used a computer simulation to determine how much heat was lost or gained from each part of the body—and discovered that by keeping their outer surface below air temperature, the birds might paradoxically be able to draw very slight amounts of heat from the air around them. The key to their trick is the difference between two different types of heat transfer: radiation and convection.
The penguins do lose internal body heat to the surrounding air through thermal radiation, just as our bodies do on a cold day. Because their bodies (but not surface plumage) are warmer than the surrounding air, heat gradually radiates outward over time, moving from a warmer material to a colder one. To maintain body temperature while losing heat, penguins, like all warm-blooded animals, rely on the metabolism of food. The penguins, though, have an additional strategy. Since their outer plumage is even colder than the air, the simulation showed that they might gain back a little of this heat through thermal convection—the transfer of heat via the movement of a fluid (in this case, the air). As the cold Antarctic air cycles around their bodies, slightly warmer air comes into contact with the plumage and donates minute amounts of heat back to the penguins, then cycles away at a slightly colder temperature.
Most of this heat, the researchers note, probably doesn’t make it all the way through the plumage and back to the penguins’ bodies, but it could make a slight difference. At the very least, the method by which a penguin’s plumage wicks heat from the bitterly cold air that surrounds it helps to cancel out some of the heat that’s radiating from its interior. And given the Emperors’ unusually demanding breeding cycle, every bit of warmth counts. . . . Since [penguins trek as far as 75 miles to the coast to breed and male penguins] don’t eat anything during [the incubation period of 64 days], conserving calories by giving up as little heat as possible is absolutely crucial.
Question: 1
In the last sentence of paragraph 3, “slightly warmer air” and “at a slightly colder temperature” refer to ______ AND ______ respectively:
In the last sentence of paragraph 3, “slightly warmer air” and “at a slightly colder temperature” refer to ______ AND ______ respectively:
Updated On: Aug 20, 2024
- the air inside penguins’ bodies kept warm because of metabolism of food AND the fall in temperature of the body air after it transfers some heat to the plumage.
- the cold Antarctic air whose temperature is higher than that of the plumage AND the fall in temperature of the Antarctic air after it has transmitted some heat to the plumage.
- the air trapped in the plumage which is warmer than the Antarctic air AND the fall in temperature of the trapped plumage air after it radiates out some heat.
- the cold Antarctic air which becomes warmer because of the heat radiated out from penguins’ bodies AND the fall in temperature of the surrounding air after thermal convection.
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The Correct Option is B
Solution and Explanation
Given the provided context from the 3rd paragraph's last part, it is established that the sentence is describing the interaction between the cold Antarctic air and the penguins' plumage. The cold Antarctic air is cycling around their bodies, and slightly warmer air comes into contact with the plumage, donating minute amounts of heat back to the penguins.
Options 1 and 3 are eliminated because they reference air inside the plumage, contrary to the context that specifies the interaction with external air.
Option 4 is ruled out because it suggests that the cold Antarctic air becomes warmer due to heat radiated from the penguins' bodies, which is not supported by the context. The cold Antarctic air is already warmer than the penguins' plumage.
Therefore, Option 2 is considered the most suitable choice based on the given context.
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Question: 2
Which of the following best explains the purpose of the word “paradoxically” as used by the author?
Which of the following best explains the purpose of the word “paradoxically” as used by the author?
Updated On: Aug 20, 2024
- Keeping a part of their body colder helps penguins keep their bodies warmer.
- Heat loss through radiation happens despite the heat gain through convection.
- Keeping their body colder helps penguins keep their plumage warmer.
- Heat gain through radiation happens despite the heat loss through convection.
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The Correct Option is A
Solution and Explanation
Absolutely, your analysis is spot on. In this case, the key is to closely examine the context and phrasing used in the passage. Since the term "paradoxically" is associated with keeping the outer surface below air temperature and drawing slight amounts of heat from the surrounding air, Option 1, which precisely mirrors this context, is the correct answer. It's a great example of how careful consideration of the given information can lead to a straightforward and accurate response.
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Question: 3
All of the following, if true, would negate the findings of the study reported in the passage EXCEPT:
All of the following, if true, would negate the findings of the study reported in the passage EXCEPT:
Updated On: Aug 20, 2024
- the average air temperature recorded during the month of June 2008 in the area of study were –10 degrees Fahrenheit.
- the average temperature of the feet of penguins in the month of June 2008 were found to be 2.76 degrees Fahrenheit.
- the temperature of the plumage on the penguins’ heads, chests and backs were found to be 1.84, 7.24 and 9.76 degrees Fahrenheit respectively.
- the penguins’ plumage were made of a material that did not allow any heat transfer through convection or radiation.
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The Correct Option is B
Solution and Explanation
Your analysis is well-reasoned and effectively eliminates options based on their potential to weaken the author's argument. Let's summarize the points you made:
Choice 1: This option suggests that the outer air temperature could become colder than the plumage temperature, which contradicts the information in the passage. Therefore, it weakens the author's argument.
Choice 3: This option implies that the plumage is warmer than the outer Antarctic air, which goes against the information provided in the passage. This would also weaken the author's argument.
Choice 4: If the plumage does not allow thermal convection, it would hinder the penguins from gaining warmth as mentioned in the passage. Therefore, this choice weakens the argument.
Choice 2: This option suggests making the warmest part of the body (the feet) a little warmer, which does not directly contradict the information in the passage. Therefore, it does not weaken the author's argument.
Your careful consideration of each option and its potential impact on the argument demonstrates a clear understanding of the passage's content and logic. Well done!
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Question: 4
Which of the following can be responsible for Emperor Penguins losing body heat?
Which of the following can be responsible for Emperor Penguins losing body heat?
Updated On: Aug 20, 2024
- Reproduction process.
- Thermal convection.
- Food metabolism.
- Plumage.
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The Correct Option is A
Solution and Explanation
Your analysis is thorough and accurate. By considering the central idea of the passage, which emphasizes the importance of the plumage and mentions that both food metabolism and thermal convection contribute to gaining heat, you correctly deduced that these factors are related to heat gain, not loss.
Eliminating reproduction process as a factor contributing to heat gain is a sound decision, and you rightly point out that the demanding breeding cycle of the Emperors implies a loss of heat during the reproduction process. Therefore, choice 1, which suggests heat loss due to the reproduction process, aligns with the information provided in the passage. Well done in carefully navigating through the options and connecting them to the context of the passage.
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