In 1910, President Theodore Roosevelt said "I recognize the right and duty of this generation to develop and use the natural resources of our land; but I do not recognize the right to waste them, or to rob, by wasteful use, the generations that come after us." His message best reflects
C) a plea for good stewardship.
THE EXPERIMENT
Researchers wanted to determine if pesticide Z was effective at killing grasshoppers that typically invade cornfields. Two ten-acre cornfields located 1 mile apart were chosen. The cornfield to the west was sprayed only with water. The cornfield on the east received the same amount of water with a 10% solution of pesticide Z. Samples of the numbers of grasshoppers in the field were made every week for 10 weeks.
RESULTS
West field treated only with water:The number of grasshoppers in the west field doubled after ten weeks.East field treated with water and pesticide Z:The number of grasshoppers in the east field declined by 50% after 10 weeks.
What was the experimental variable in the experiment?
Pesticide Z
THE EXPERIMENT
Researchers wanted to determine if pesticide Z was effective at killing grasshoppers that typically invade cornfields. Two ten-acre cornfields located 1 mile apart were chosen. The cornfield to the west was sprayed only with water. The cornfield on the east received the same amount of water with a 10% solution of pesticide Z. Samples of the numbers of grasshoppers in the field were made every week for 10 weeks.
RESULTS
West field treated only with water:The number of grasshoppers in the west field doubled after ten weeks.East field treated with water and pesticide Z:The number of grasshoppers in the east field declined by 50% after 10 weeks.
Based on the result of the experiment, which of the following is the most accurate conclusion?
If a cornfield is sprayed with pesticide Z, it will have fewer grasshoppers 10 weeks later.
Complete the chemical equation of photosynthesis: aCO2 + bH2O = cC6H12O6 + dO2
A. a = 6, b = 6, c = 1, d = 6
If atmospheric carbon dioxide were eliminated from Earth's atmosphere, which of the following would be true?
A. The Earth would cool considerably, and photosynthesis would dramatically decrease.
Which of the following best describes ecotones?
C) They are transitional regions between ecosystems and may contain unique species.
Nina got a new baby turtle from a friend and is told to feed it worms. For the first few months, the turtle seemed to grow well. But as time passed, the turtle's shell appeared soft and fragile. Someone suggested that the turtle might not be getting enough calcium in its diet. If this is true for this turtle, dietary calcium is
C) a limiting factor.
A population that is at equilibrium
D) is staying at about the same size.
If a country experiences 4 births, 3 deaths, and 2 new emigrant every minute of a year, how will its population change in one year?
C) The population will decline by about half million people.
A keystone species
B) has a disproportionately large impact on the stability of an ecosystem.
The separate feeding locations of five warbler species on different portions of the same tree illustrates the principle of
B) resource partitioning.
Student Young estimates natural change in the population of a small city. Crude birth rate and crude death rate of the city are 10 and 20, respectively. Assuming no emigration or immigration, what is natural % increase or decrease in the population?
C) 1% decrease
(10-20)/10 = -1% (see the “Birth and death rates” slide in Module 2.1 The Human Population)
If you only had one million dollars to spend on a population of 10,000 people in a village in a developing country, which of the following would have the greatest impact on their health?
A) Creation of reliable source of clean water, proper sewage systems and maternal health
Which of the following human traits are typical of K-strategists?
C) Parental care of long duration
A country with a declining fertility rate that is below 2.0
B) All of these are true.
Even if a developing country reduces its birth rate and maintains replacement-level fertility, its population will still continue to grow for several decades because of _____________. This population growth is due to the current number of people in the childbearing age-range.
B) population momentum
If the United States or Sweden had an age structure like a developing country,
C) the educational system would need to double the number of elementary schools.
Which of the following activities would be consistent with the Millennium Development Goals addressing health and hunger?
C) Providing meals and mosquito nets for every child under the age of five
In general, problems caused by economic activities are
D) addressed by laws and public policies.
From an ecological economist's perspective, without sustainability, as economies grow,
A) the natural world is depleted.
Large stocks of fish in the Great Lakes represent
C) renewable natural capital.
Which part of the government is responsible for passing public-policy laws?
B) Legislative branch
The preparation and publication of the book Silent Spring represented which stage of the policy life cycle?
