GED GED-Science 問題集

質問 1：
Animal populations are regulated by a variety of natural factors. Five of these factors are:
- competition-A struggle among rival organisms results when available resources
(for example, food or shelter) are limited. - predation-Many animals pursue and eat other animals as prey. - disease-In overcrowded populations, the buildup of waste products contributes to
the easy spread of disease. - stress-In some populations, overcrowding can lead to hormonal disorders, which can cause abnormal behavior, thereby limiting the population. - natural disaster-The occurrence of storms, floods, and earthquakes can significantly affect a population's size.
- During the Middle Ages, the human population of Western Europe was severely reduced by a combination of unsanitary conditions and the abundance of flea-infested rats that spread the plague.
Based on the information provided, which of the following factors was responsible for the population reduction?
A. disease
B. competition
C. natural disaster
D. stress
E. predation
正解：A

質問 2：
George's duties include serving meals, giving medication, scheduling tests, changing linens, and taking people's blood pressures.
What is George's profession?
A. education aid
B. nurse
C. admissions clerk
D. medical technician
E. housekeeper
正解：B

質問 3：
Two students are testing the effect of light intensity on photosynthesis. They place a green aquarium plant inside a clear glass container of pond water and turn on a floodlight located three feet away. Bubbles of oxygen soon come from the plant. Then, the students move the floodlight a foot closer to the glass and leave it for ten minutes.
Exhibit: Which of the following statements represents the BEST prediction about the aquarium and its contents?

A. The bubbles decrease in size.
B. The rate of bubbling increases.
C. The bubbles come from the upper parts of the plants.
D. The bubbles come from the lower parts of the plants.
E. The plant is floating on the surface of the water.
正解：B

質問 4：
Garbage, or "municipal solid waste," is composed of seven main items, which include plastics, food and yard wastes, paper, metals, glass, and other nonspecific trash. The type of garbage in a garbage dump can be related to the lifestyle of the people using the dump.
Exhibit:

According to the graph at the left, which statement is the BEST interpretation of this
community's use of the garbage dump?
A. Paper recycling is evident from the garbage composition.
B. Most of the residents use glass containers rather than plastic containers.
C. The area is made up of mostly high-rise apartment buildings with very little yard space.
D. If the residents started a successful recycling program, the percentages of the seven main items in the garbage dump would not change.
E. The area residents disposed of more paper products than any other garbage type.
正解：E

質問 5：
An electromagnet is a magnet that can be turned on and off. It consists of a central metal core, such as iron, and many wrappings of wire around the metal core. An electrical current sent through the wire wrappings causes the formation of a magnetic field. There are several ways to increase the strength of an electromagnet: increasing the number of wrappings, increasing the current of electricity, making the wrappings closer together, or increasing the diameter of the core.
Five electromagnets are shown above. The electrical power source for each electromagnet is an ordinary flashlight battery.

Which electromagnet will produce the strongest magnetic field?
A. D
B. A
C. B
D. C
E. E
正解：A

質問 6：
Below is a graph of the world's population over the past 2000 years. The population size remained fairly steady until about the year 1200. As the standard of living started to improve, the human population began a period of rapid growth in the 1800s. By 1975, world population reached approximately 4 billion people. The projected population for year 2012 is 7 billion people.

Based on the information and graph, which statement best describes the growth of world population?
A. growth rate is almost zero in the early years of the 21st century
B. is currently the same as it was 2000 years ago
C. is gradually decreasing
D. has increased at a slow and steady rate over the past 2000 years
E. is increasing rapidly
正解：E

質問 7：
-- 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 -
What relationship was the experiment designed to explore?
The relationship between light and:
A. the rate of photosynthesis
B. plant consumption of carbon dioxide
C. amount of liquid in the flask
D. the color of bromthymol blue
E. plant production of water
正解：B