[简答题]

POPULATION ECOLOGY

1 Population ecology is the science that measures changes in population size and composition and identifies the causes of these fluctuations．Population ecology is not concerned solely with the human population．In ecological terms．a population consists of the individuals of one species that simultaneously occupy the same general area．rely on the same resources, and are affected by similar environmental factors．The characteristics of a population are shaped by its size and by the interactions among individuals and between individuals and their environment．
2 Population size is a balance between factors that increase numbers and factors that decrease numbers．Some factors that increase populations are favorable light and temperature，adequate food supply, suitable habitat, ability to compete for resources, and ability to adapt to environmental change．Factors that decrease populations are insufficient or excess

[简答题]
1 Population ecology is the science that measures changes in population size and composition and identifies the causes of these fluctuations．Population ecology is not concerned solely with the human population．In ecological terms．a population consists of the individuals of one species that simultaneously occupy the same general area．rely on the same resources, and are affected by similar environmental factors．The characteristics of a population are shaped by its size and by the interactions among individuals and between individuals and their environment．
2 Population size is a balance between factors that increase numbers and factors that decrease numbers．Some factors that increase populations are favorable light and temperature，adequate food supply, suitable habitat, ability to compete for resources, and ability to adapt to environmental change．Factors that decrease populations are insufficient or excess

[单项选择]
1 Population ecology is the science that measures changes in population size and composition and identifies the causes of these fluctuations．Population ecology is not concerned solely with the human population．In ecological terms．a population consists of the individuals of one species that simultaneously occupy the same general area．rely on the same resources, and are affected by similar environmental factors．The characteristics of a population are shaped by its size and by the interactions among individuals and between individuals and their environment．
2 Population size is a balance between factors that increase numbers and factors that decrease numbers．Some factors that increase populations are favorable light and temperature，adequate food supply, suitable habitat, ability to compete for resources, and ability to adapt to environmental change．Factors that decrease populations are insufficient or excessive
A. Any species of life can be studied in population ecology．
B. Population ecologists care about the future of humanity．
C. The growth of the human population is a major concern．
D. Population ecology does not consider humans worthy of study．

[填空题]India’ s population will surge toward a projected ______in 2025.

[简答题]decrease China’s population It is reported that.., affect control stress take effective actions

[单项选择]Task 2
Many of the world’s population problems have been caused by the crowding of large groups of people into the cities. Supply for the needs of the people leads to further pollution by industry. If rapid increase of world population in countries continues at the present rate, there may be much greater harm to human beings. Some scientists speak of the increase in numbers of people as "population pollution".
About 2000 years ago, the world population was probably about 250 million; it reached a billion in 1850. By 1930 the population was two billion. It is now three and a half billion. It is expected to double by the year 2005. If the population continues to grow at the same rate, there will be 25 billion people in the world a hundred years from now!
Man has been using the earth’s resources more and more rapidly over the past years. Some of them are ah-nost used tip. Now many people believe that man’s greatest problem is how to control the growth of the populatio
A. 7 billion
B. 250 million
C. 25 billion
D. 3.5 billion