test 3 Flashcards
Ecological diversity is a measure of the number of…
niches, trophic levels and ecological processes of a biological community
If managed carefully, ecotourism benefits natural areas by giving economic value to land and water resources…
without destroying them
Corridors have the potential to effectively enlarge which of the following?
preserve areas, genetic pools, feeding ranges, and areas of refuge against natural disasters
Why is it useful to classify pesticides by their chemical structure?
similar chemical structures often relate to similar toxicological characteristics
The efficiency of irrigation water use it ___ in most countries. One of the reasons for this is ____
low; evaporative losses from unprotected water channeling
Biological hotspots are those areas with…
at least 1500 endemic species and 70% loss of habitat
Most public rangelands are in poor condition due to..
overcrowding of private livestock
The three crops that humans rely on for the majority of nutrients and calories are…
wheat, rice and corn
The Green Revolution began out of a need to do which of the following..
feed those in India and Pakistan who were suffering great famines
Annual row crops such as ____ cause the highest erosion rates because ___.
corn and beans; soil is left bare for the majority of the year
The main reason for the current high rate of animal extinctions is…
habitat destruction worldwide
Habitat fragmentation usually leads to a(n)…
decrease in biodiversity
According to the Harvard Food Pyramid, which of the following should be eaten sparingly?
red meat
It takes 8 kg of grain to produce which of the following?
1 kg beef
Which of the following are inorganic pesticides?
arsenic, copper, and mercury
Food security has to do with…
the ability of a population to obtain food on a day to day basis
Which are two common diseases that result from protein deficiencies?
marasmus and kwashiorkor
Pesticide resistance occurs when a population of pests…
genetically changes (through natural selection) and is no longer affected by the chemicals
Which of the following can be found in soil?
fungus, algae, insects, and bacteria are all found in soil
Rill erosion can lead to…
gully erosion
Which of the following is true about aquaculture operations?
supplies 1/2 of seafood eaten globally, 1/3 of the wild fish caught are used for food for these operations, large quantities of feces and antibiotics are released to the waters, and forests and wetlands are being destroyed to build these operations
A promising approach to encourage conservation and preservation in developing countries is…
debt-for-nature swaps
The process that happens when pesticide residues evaporate from soil and water in warm areas and then condense in and precipitate in colder regions is called…
the grasshopper effect
Economically, monoculture forestry is advantageous because…
it produces large quantities of a single type of tree for a particular use, such as building timber or paper pulp
Which of the following is NOT a risk associated with intensive food production?
increased yields
Anemia is a common disease resulting from a shortage of dietary…
iron
The parent material layer of a soil is composed of weathered…
rock fragments
People can suffer malnourishment if they consume large amounts of ___ instead of ___.
fat and sugar; vitamins and protein
A species that is naturally rare or that has been depleted to dangerous levels is known, according to the Endangered Species Act, as a ___ species.
vulnerable
A species in imminent danger of extinction is classified by the U.S. Endangered Species Act is…
endangered
The pesticide treadmill occurs when…
constantly increasing doses of pesticides are needed to control pests
____, ____, and ____ are the largest producers of both paper pulp and industrial wood.
Russia, Canada, and the United States
High responder crops of the green revolution produce tremendous yields…
in response to fertilizers, pesticides, and irrigation
Which of the following textural classifications is most suited for agricultural production?
loam
Soil organisms usually stay ____ the soil.
close to the surface of
The main reason that there are relatively few invertebrates categorized as endangered species is because…
we consider other groups, such as mammals, to be more interesting and desirable
With respect to chemical pest controls, integrated pest management (IPM) uses…
the minimum amount necessary as a last resort
The objective of a species recovery plan is to…
increase an endangered species population until it is no longer endangered
Wind erosion is most likely to cause problems in…
open, arid regions
The stratified horizontal layers of soils are called soil…
horizons
Conservationists and wildlife managers use gap analysis to…
find unprotected landscapes that are rich in species
A broad-spectrum biocide is designed to kill…
a wide range of living organisms
Semi-dward wheat differs from conventional wheat in which of the following ways?
higher yields than conventional wheat, resists lodging as compared to conventional wheat, and responds better to more fertilizer and water than conventional species
Developed countries produce ___ of all industrial wood and account for ___ of its consumption.
less than half; about 80%
Most of the livestock grown in North America are…
raised in CAFOs
The acronym that stands for habitat, destruction, invasive species, pollution, human population and over harvesting is…
HIPPO
DDT accumulation in North American eagles, pelicans, and other birds disrupted birds’ calcium metabolism, causing…
thin eggshells
Although most of the world’s forests are shrinking, biologists are especially concerned about tropical forest loss because…
they contain such high biodiversity
Ecological diversity is a measure of the number of…
niches, trophic levels, and ecological processes of a biological community
Approximately how many species have been identified on Earth?
1.7 million
Which of the following is a benefit of biodiversity for humans?
aesthetics, ecological services, food, drugs and medicines
The total number of living species is probably…
between 3 and 50 million
Biodiversity hotspots are…
areas that contain at least 1500 endemic species and have lost 70% of their habitat
The richest farming soils that form under grasslands of central North America and under moist deciduous forests are…
mollisols and alfisols
In developed countries, the most recent increases in agricultural productivity have come from…
irrigation, increased fertilization, and new crop varieties
Stratified horizontal layers of soil are called…
horizons
Wind erosion is most likely to cause problems in…
open, arid regions
Rill erosion can lead to…
gully erosion
Who was the father of the Green Revolution?
Norman Bourlaug
High responder crops of the Green Revolution produce tremendous yields…
in response to fertilizers, pesticides and irrigation
An important role of the Conservation Reserve Program is to…
pay farmers to take highly erodible land out of production
Which of the following is not a risk associated with intensive food production?
increased yields
At the current pace of fish harvesting, the world’s fisheries will be exhausted by…
2050
