GED-Science 無料問題集「GED Science」
A contour line is a line passing through points with the same altitude above sea level. A steep slope is represented by closely spaced contour lines; widely spaced contour lines show a more gradual incline.
A topographic map displays these contour lines and helps outline the shape of the landscape locating hills, cliffs, and depressions.
Based on the topographic map at the left, if a person wants to travel on level ground as much as possible, which would be the easiest path between points A and B?
Exhibit:
Exhibit
A topographic map displays these contour lines and helps outline the shape of the landscape locating hills, cliffs, and depressions.
Based on the topographic map at the left, if a person wants to travel on level ground as much as possible, which would be the easiest path between points A and B?
Exhibit:
Exhibit
正解：B
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Science is a systemized body of knowledge based on observation and experimentation. Technology involves applied science and the practical applications of scientific knowledge. The making of lenses for eyeglasses is a technology that is based on the scientific principles of optics explaining how light rays are bent by finely ground lenses.
Which example would be considered science rather than technology?
Which example would be considered science rather than technology?
正解：B
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The digestive tract of an animal that eats meat is about four times the length of the animal's body. In an animal that eats plants, the digestive tract is about twenty times the length of the animal's body.
Which animal would be expected to have the longest digestive tract relative to its body length?
Which animal would be expected to have the longest digestive tract relative to its body length?
正解：C
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A series circuit is one in which current flows only in one path. The same amount of current flows through the entire circuit when it is in series, and each bulb receives the same amount of current. If there is a break in the circuit, none of the bulbs will light.
The diagram at the left shows a series circuit. Which is an example of a series circuit?
The diagram at the left shows a series circuit. Which is an example of a series circuit?
正解：C
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Making products from recycled materials, such as aluminum cans, glass, and plastic usually saves energy and other resources. For example, it takes about 75% less energy to make steel from scrap than from ore. All forms of recycling involve some energy to produce the recycled materials, a process that also results in the production of some pollution.
The chart at the left shows the energy savings from recycling.
When Anil is at the grocery store, he can choose to buy juice in a glass bottle, an aluminum can, a plastic jug, a juice box (paper), or foil-covered juice container.
If Anil's community requires that he recycles, which container would provide the MOST overall energy savings?
The chart at the left shows the energy savings from recycling.
When Anil is at the grocery store, he can choose to buy juice in a glass bottle, an aluminum can, a plastic jug, a juice box (paper), or foil-covered juice container.
If Anil's community requires that he recycles, which container would provide the MOST overall energy savings?
正解：A
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Air is a mixture of gases, mostly nitrogen and oxygen, but it also contains a small amount of water vapor. Depending on its temperature, water can exist in any of the three states of matter.
In the diagram at the left, water droplets have formed on the outside of the can, and the can contains pieces of ice.
Based on the information and diagram, which statement regarding the droplets on the outside of the can is the most accurate?
In the diagram at the left, water droplets have formed on the outside of the can, and the can contains pieces of ice.
Based on the information and diagram, which statement regarding the droplets on the outside of the can is the most accurate?
正解：A
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The waters of the Antarctic region contain an abundance of animal and plant life. The large number of living organisms stems partly from the water's high mineral content and partly from the constant cold temperature. The continual flow of materials from below brings nitrates and phosphates into the surface zone. Cold water holds more dissolved carbon dioxide and oxygen than does warm water. The abundance of carbon dioxide and the available sunlight allow photosynthesis to occur in the surface waters almost continuously during the long daylight hours in the summer.
If the temperature of the Antarctic waters increased by a marked degree, which of the following statements would explain a decrease in the abundant life there now?
If the temperature of the Antarctic waters increased by a marked degree, which of the following statements would explain a decrease in the abundant life there now?
正解：A
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Many years ago, beavers were introduced to a region of California that they had not previously inhabited. Forty years later, the beaver population had grown so much that a cluster of aspen trees used by the beavers for food and building materials inside the national forest became endangered. The beavers were also interfering with the water systems.
In retrospect, how would biologists most likely evaluate the impact of the introduction of the beaver?
In retrospect, how would biologists most likely evaluate the impact of the introduction of the beaver?
正解：E
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Bernoulli discovered that fast-moving air creates less pressure than does slow-moving air. He thought this seemed the opposite of what would be reasonable, but repeated experiments proved it to be true. He held a piece of paper up to his mouth, as shown below, and blew across it. The paper tilted upward. This happens because the faster moving air results in less pressure on top of the page, causing the greater pressure under the paper to push the paper upward.
Exhibit:
Based on the information, why can a smoky car interior be cleared out rapidly by lowering a window slightly while the car is moving?
Exhibit:
Based on the information, why can a smoky car interior be cleared out rapidly by lowering a window slightly while the car is moving?
正解：A
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-- Exhibit -
Since carbon dioxide dissolves in water to form an acid, an acid-base indicator such as bromthymol blue is used to track the acid concentration during plant photosynthesis and respiration. Bromthymol blue turns yellow in an acid solution and remains blue in a basic solution. The color change is reversible. A student used the following procedure to track carbon dioxide.
In an experiment, a student placed a solution of bromthymol blue into each of two flasks, inserted a drinking straw in each flask, and blew through the straw until the solution turned from blue to yellow. Carbon dioxide, a waste product in the student's breath, caused the color change. The student then placed a small Elodea water plant in each flask and closed the flasks with rubber stoppers. Flask A was placed in bright sunlight, while flask B was placed in the dark for 24 hours, as shown in the figure below.
After 24 hours, the bromthymol blue in flask A had turned back to blue, while in flask B it was still yellow.
-- Exhibit -
If living things use oxygen and release carbon dioxide during respiration, what is the most probable reason that the atmosphere does not become depleted of oxygen and become filled with carbon dioxide?
Since carbon dioxide dissolves in water to form an acid, an acid-base indicator such as bromthymol blue is used to track the acid concentration during plant photosynthesis and respiration. Bromthymol blue turns yellow in an acid solution and remains blue in a basic solution. The color change is reversible. A student used the following procedure to track carbon dioxide.
In an experiment, a student placed a solution of bromthymol blue into each of two flasks, inserted a drinking straw in each flask, and blew through the straw until the solution turned from blue to yellow. Carbon dioxide, a waste product in the student's breath, caused the color change. The student then placed a small Elodea water plant in each flask and closed the flasks with rubber stoppers. Flask A was placed in bright sunlight, while flask B was placed in the dark for 24 hours, as shown in the figure below.
After 24 hours, the bromthymol blue in flask A had turned back to blue, while in flask B it was still yellow.
-- Exhibit -
If living things use oxygen and release carbon dioxide during respiration, what is the most probable reason that the atmosphere does not become depleted of oxygen and become filled with carbon dioxide?
正解：B
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When a cell, such as a red blood cell, is placed in pure distilled water, water will move into the cell, causing it to expand and burst. However, most plant cells, which are surrounded by a tough cellulose wall, will not burst when placed in pure distilled water.
This information indicates which of the following statements about cells?
This information indicates which of the following statements about cells?
正解：C
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Using new, advanced methods of biotechnology, scientists can produce copies of genes of one species and insert them into the chromosomes of another species. The resulting transgenic plants offer potential advantages that are unobtainable through conventional methods.
A gene that is active against corn borers is inserted into corn plants.
When the plants reach maturity, which of the following outcomes might be expected?
A gene that is active against corn borers is inserted into corn plants.
When the plants reach maturity, which of the following outcomes might be expected?
正解：E
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Bacteria are one-celled organisms that grow and reproduce in the right conditions. They
reproduce by dividing in half and can divide in as little as every 20 minutes. The graph below describes how the growth of bacteria actually changes over time.
Which section of the graph shows what happens when the food supply is used up and the bacteria are dying?
reproduce by dividing in half and can divide in as little as every 20 minutes. The graph below describes how the growth of bacteria actually changes over time.
Which section of the graph shows what happens when the food supply is used up and the bacteria are dying?
正解：A
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Flowers are the reproductive part of some plants. The stamen is the male reproductive organ while the pistil is the female organ. At the tip of the stamen is the anther, which forms pollen grains in which the sperm cells are formed. Pollen grains are transferred to the pistil by wind, water, insects, and other mechanisms.
Which statement best interprets the diagram and information?
Exhibit:
Which statement best interprets the diagram and information?
Exhibit:
正解：C
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