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Directions: Answer the question based on the following reading passage.
Since the Hawaiian Islands have never been connected to other land masses, the great
variety of plants in Hawaii must be a result of the long-distance dispersal of seeds, a
process that requires both a method of transport and an equivalence between the ecology
of the source area and that of the recipient area.
There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.
Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order to
  • a)
    support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seeds
  • b)
    lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaii
  • c)
    suggest that the long-distance dispersal of seeds is a process that requires long periods of time
  • d)
    challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaii
  • e)
    refute the claim that Hawaiian flora evolved independently from flora in other parts of the world
Correct answer is option 'D'. Can you explain this answer?
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Directions: Answer the question based on the following reading passag...
This question asks why the author mentions flotation experiments. Flotation experiments
are mentioned in the passage in order to show that some evidence casts doubt on the claim that ocean currents were the means by which seeds were transported to Hawaii. Thus, Choice D is correct. Choice A is incorrect since the claim that plant distribution in Hawaii is the result of long-distance dispersal of seeds is a given in the passage, not an idea that the author feels a need to substantiate. Choice B is eliminable since the flotation experiments are introduced at a point where the author is challenging, rather than lending credibility to, the air current hypothesis and because flotation experiments would more likely reflect on ocean currents than air currents. Choice C is eliminable since the passage does not address the length of time required for long distance seed dispersal. Finally, Choice E is eliminable since it too describes an idea that is not discussed in the passage.
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Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these hypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author of the passage is primarily concerned with

Directions: After reading the passage, read and respond to the questions that follow by selecting the best choice for each one.[1] An atmospheric gas that absorbs and emits thermal radiation in the infrared range is known as a greenhouse gas. [2] Without such gases, the surface temperature of the earth would have been a frigid -18°C instead of the current 15°C. [3] Many climate scientists claim that human activities since the beginning of the Industrial Revolution have led to a steady increase in the atmospheric concentration of many greenhouse gases, with a consequent increase in the planet's surface temperature by about 0.85°C in the last 130 years. [4] However, in order to correctly estimate the anthropogenic changes in earth's surface temperature, it is important to quantify the effect of external natural factors like large volcanic eruptions on the planet's surface temperature.[5] Though volcanic eruptions emit carbon dioxide, a greenhouse gas, the atmospheric concentration of this gas is about 16000 times the amount released by volcanic eruptions; therefore, no matter how large a volcanic eruption is, it cannot produce a significant change in the atmospheric carbon dioxide levels. [6] Further, the total amount of carbon dioxide emitted per year by volcanic eruptions – between 130 and 230 million tons – is roughly equivalent to that emitted in only three to five days of human activity.[7] It is mainly through the emission of sulfur dioxide gas and ash particles into the atmosphere that large volcanic eruptions affect earth's surface temperature. [8] Sulfur dioxide reacts with the water vapor present in air to form fine particles called sulfate aerosols. [9] Winds spread the cloud of aerosols and ash particles around the globe in weeks. [10] These particles absorb incoming solar radiation and scatter it back into space, thereby producing a cooling effect on the earth. [11] They take several years to settle out of the atmosphere and thus impact the global surface temperature for many years. [12] Robock and Mao have shown that for two years after a great volcanic eruption, the surface temperature decreases by 0.1 – 0.2°C. [13] The 1991 Pinatubo eruption in Indonesia was one of the largest volcanic eruptions in the twentieth century and resulted in a global surface cooling of 0.5°C for about two to four years after the eruption.[14] The El Chichón eruption in 1982 was the first major eruption whose climatic impact was studied in detail by modern instruments. [15] Though the emission volume of this eruption was similar to the Mount St. Helens eruption in 1980, El Chichón released seven times the amount of sulfate aerosols released by Mount St. Helens and lowered the earth's temperature by about 0.4°C as against a decrease of only 0.1°C for Mount St. Helens.Q. With which of the statements about changes in the earth's surface temperature is the author most likely to disagree?

Directions: After reading the passage, read and respond to the questions that follow by selecting the best choice for each one.[1] An atmospheric gas that absorbs and emits thermal radiation in the infrared range is known as a greenhouse gas. [2] Without such gases, the surface temperature of the earth would have been a frigid -18°C instead of the current 15°C. [3] Many climate scientists claim that human activities since the beginning of the Industrial Revolution have led to a steady increase in the atmospheric concentration of many greenhouse gases, with a consequent increase in the planet's surface temperature by about 0.85°C in the last 130 years. [4] However, in order to correctly estimate the anthropogenic changes in earth's surface temperature, it is important to quantify the effect of external natural factors like large volcanic eruptions on the planet's surface temperature.[5] Though volcanic eruptions emit carbon dioxide, a greenhouse gas, the atmospheric concentration of this gas is about 16000 times the amount released by volcanic eruptions; therefore, no matter how large a volcanic eruption is, it cannot produce a significant change in the atmospheric carbon dioxide levels. [6] Further, the total amount of carbon dioxide emitted per year by volcanic eruptions – between 130 and 230 million tons – is roughly equivalent to that emitted in only three to five days of human activity.[7] It is mainly through the emission of sulfur dioxide gas and ash particles into the atmosphere that large volcanic eruptions affect earth's surface temperature. [8] Sulfur dioxide reacts with the water vapor present in air to form fine particles called sulfate aerosols. [9] Winds spread the cloud of aerosols and ash particles around the globe in weeks. [10] These particles absorb incoming solar radiation and scatter it back into space, thereby producing a cooling effect on the earth. [11] They take several years to settle out of the atmosphere and thus impact the global surface temperature for many years. [12] Robock and Mao have shown that for two years after a great volcanic eruption, the surface temperature decreases by 0.1 – 0.2°C. [13] The 1991 Pinatubo eruption in Indonesia was one of the largest volcanic eruptions in the twentieth century and resulted in a global surface cooling of 0.5°C for about two to four years after the eruption.[14] The El Chichón eruption in 1982 was the first major eruption whose climatic impact was studied in detail by modern instruments. [15] Though the emission volume of this eruption was similar to the Mount St. Helens eruption in 1980, El Chichón released seven times the amount of sulfate aerosols released by Mount St. Helens and lowered the earth's temperature by about 0.4°C as against a decrease of only 0.1°C for Mount St. Helens.Q. If the claims made by the climate scientists about the anthropogenic increase in Earth's surface temperature are correct, the passage best supports which of the following explanations for zero increase in the surface temperature of the earth during a decade in which anthropogenic emissions of greenhouse gases continued to increase?

Directions: After reading the passage, read and respond to the questions that follow by selecting the best choice for each one.[1] An atmospheric gas that absorbs and emits thermal radiation in the infrared range is known as a greenhouse gas. [2] Without such gases, the surface temperature of the earth would have been a frigid -18°C instead of the current 15°C. [3] Many climate scientists claim that human activities since the beginning of the Industrial Revolution have led to a steady increase in the atmospheric concentration of many greenhouse gases, with a consequent increase in the planet's surface temperature by about 0.85°C in the last 130 years. [4] However, in order to correctly estimate the anthropogenic changes in earth's surface temperature, it is important to quantify the effect of external natural factors like large volcanic eruptions on the planet's surface temperature.[5] Though volcanic eruptions emit carbon dioxide, a greenhouse gas, the atmospheric concentration of this gas is about 16000 times the amount released by volcanic eruptions; therefore, no matter how large a volcanic eruption is, it cannot produce a significant change in the atmospheric carbon dioxide levels. [6] Further, the total amount of carbon dioxide emitted per year by volcanic eruptions – between 130 and 230 million tons – is roughly equivalent to that emitted in only three to five days of human activity.[7] It is mainly through the emission of sulfur dioxide gas and ash particles into the atmosphere that large volcanic eruptions affect earth's surface temperature. [8] Sulfur dioxide reacts with the water vapor present in air to form fine particles called sulfate aerosols. [9] Winds spread the cloud of aerosols and ash particles around the globe in weeks. [10] These particles absorb incoming solar radiation and scatter it back into space, thereby producing a cooling effect on the earth. [11] They take several years to settle out of the atmosphere and thus impact the global surface temperature for many years. [12] Robock and Mao have shown that for two years after a great volcanic eruption, the surface temperature decreases by 0.1 – 0.2°C. [13] The 1991 Pinatubo eruption in Indonesia was one of the largest volcanic eruptions in the twentieth century and resulted in a global surface cooling of 0.5°C for about two to four years after the eruption.[14] The El Chichón eruption in 1982 was the first major eruption whose climatic impact was studied in detail by modern instruments. [15] Though the emission volume of this eruption was similar to the Mount St. Helens eruption in 1980, El Chichón released seven times the amount of sulfate aerosols released by Mount St. Helens and lowered the earth's temperature by about 0.4°C as against a decrease of only 0.1°C for Mount St. Helens.Q. The facts presented in the last paragraph of the passage support which of the following conclusions?

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Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer?
Question Description
Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer? for GRE 2024 is part of GRE preparation. The Question and answers have been prepared according to the GRE exam syllabus. Information about Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for GRE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for GRE. Download more important topics, notes, lectures and mock test series for GRE Exam by signing up for free.
Here you can find the meaning of Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Directions: Answer the question based on the following reading passage.Since the Hawaiian Islands have never been connected to other land masses, the greatvariety of plants in Hawaii must be a result of the long-distance dispersal of seeds, aprocess that requires both a method of transport and an equivalence between the ecologyof the source area and that of the recipient area.There is some dispute about the method of transport involved. Some biologists argue that ocean and air currents are responsible for the transport of plant seeds to Hawaii. Yet the results of flotation experiments and the low temperatures of air currents cast doubt on these ypotheses. More probable is bird transport, either externally, by accidental attachment of the seeds to feathers, or internally, by the swallowing of fruit and subsequent excretion of the seeds. While it is likely that fewer varieties of plant seeds have reached Hawaii externally than internally, more varieties are known to be adapted to external than to internal transport.Q. The author mentions the results of flotation experiments on plant seeds (lines 7–8) most probably in order toa)support the claim that the distribution of plants in Hawaii is the result of the long-distance dispersal of seedsb)lend credibility to the thesis that air currents provide a method of transport for plant seeds to Hawaiic)suggest that the long-distance dispersal of seeds is a process that requires long periods of timed)challenge the claim that ocean currents are responsible for the transport of plant seeds to Hawaiie)refute the claim that Hawaiian flora evolved independently from flora in other parts of the worldCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice GRE tests.
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