question

A set of methods to control pest organisms by using natural ecological interactions

answer

biological control

question

The practice of maintaining wild herbivores in their native habitat to be harvested for meat and other products

answer

game ranching

question

An agricultural practice in which the land is not plowed for most of the years

answer

contour plowing

question

Use of predators;parasites, and competitors for pest control defines which of the following?

answer

biological pest control

question

overgrazing impact the land in which of the following ways

answer

II and III (Animals trample and compact the soil)

question

Modern demand-based agriculture involves all the of the following characteristics except:

answer

cultivation of subsistence crops

question

Integrated pest management involves all of the following except:

answer

Use of intense land plowing to increase yileds

question

Eating low on the food chain is more efficient than eating high on it. However according to the Environmental Science text, conversion of all present rangeleand to cropland would increase environmental damage because:

answer

Not all land is suitable for agriculture; some is better suited to grazing

question

About one third (~33%) of the Earth's land has climates that should produce deserts, but about 43% actually is desert. What one dominant force is believe to be the cause of this excess desert land?

answer

Human activities

question

Which of the following in not a major symptom of desertification?

answer

Pollution by sediment, fertilizers, and pesticides

question

No-till agriculture is a agricultural technique where:

answer

the land is not plowed

question

In the recent past, the single most effective method to reduce soil erosion has been

answer

Contour plowing

question

Overgrazing of pasture lands occurs when:

answer

Vegetation is removed by cattle or other domesticated animals

question

Deserts occur naturally where:

answer

there is too little water for substantial plant growth

question

When a pest develops resistance to a chemical, all of the following are true except:

answer

mutation and genetic drift took place

question

All of the following measures can help prevent desertification except:

answer

Maximum use of marginal land

question

The type of soil at particular site depends on many factors. Which of the following is not a factor influencing the soil type?

answer

Biomagnification

question

Contour plowing has all of the following characteristics except:

answer

Plowing runs perpendicular to the contours of the land, channeling runoff downslope

question

Practices that can sustain the fertility of soils include all of the following except:

answer

Plowing up and down slopes to channel runoff away quickly

question

The farming of marine organisms

answer

mariculture

question

Crops that are grown to be sold or traded in a large market

answer

cash crop

question

Crops that are used directly for food by the farmer or sold locally

answer

subsistence crop

question

About 11% of the earth's surface (excluding Antarctica) is under agriculture. In simple terms, if the world's human population doubles in the future, then either the total agricultural acreage must double or else ________ must double.

answer

agricultural yields per acre

question

Regions in the U.S. differ greatly in their capacity for crop production. This means that the human population has to

answer

adapt to the region and grow what grows best

question

Which of the following refers to lack of a specific chemical component of food:

answer

Malnourishment

question

Crops genetically engineered to fix nitrogen would have which of the following advantages?

answer

Would require less chemical fertilizer

question

What is the relationship between farming and ecological succession:

answer

farming keeps the land in an early successional stage

question

Monoculture is associated with all of the following except:

answer

Constant agro-ecosystem

question

Global warming may have profound consequences on the Earth's ability to produce food. What is considered the most likely impact of global warming:

answer

it will shift zones of food production and cause local disruption

question

Eating low on the food chain is more efficient than eating high on it. However according to the E.S. text, conversion of all present rangeland to cropland would increase environmental damage because:

answer

Not all land is suitable for agriculture; some is better suited to grazing

question

Hydroponics refer to:

answer

the growing of plants in a fertilized water solution on an artificial substrate

question

The majority of the world's food supply is obtained by:

answer

Fishing and aquaculture in oceans and freshwater lakes

question

In order of importance, the world's four most important crop species are:

answer

Wheat, rice, corn, potatoes

question

Agro-ecosystems differ from natural ecosystems in all of the following ways except:

answer

Agro-ecosystems keep themselves in an unchanging condition

question

The reason that weeds compete so effectively against crops and must be inhibited or removed is that:

answer

weeds are early successional species and naturally do well on cleared land

question

Plowing, the regular mixing of the top layer of the soil, is precisely like what natural process:

answer

No natural process is much like plowing

question

All of the following would be considered "cash crops" except for

answer

potatoes

question

There are something like 250,000 species of plants on Earth. About _______ of those are used for food by humans, and about ________ are cultivated on a large scale

answer

300; 100

question

Agriculture in less developed countries is affected significantly by all of the following except:

answer

succession

question

Aquaculture refers to

answer

the production of aquatic animals for food

question

Monocultures are more vulnerable to outbreaks of diseases because farming

answer

simplifies the ecosystem

question

Liebegs "Law of the Minimum" says that

answer

some single factor determines the presence and growth of a given species

question

Cellulose has all of the following characteristics except:

answer

It is converted by bacteria in the human stomach

question

Our modern food problem is the result of

answer

the great increase in human population growth

question

Goals for genetic engineering of the crop species include all of the following except:

answer

Plants that spread freely to any and all open land

question

There is pressure in many developing countries for farmers to grow crops for export to generate hard currency to repay international debt. These types of crops are called

answer

cash crops

question

The current population of Demographica Island is 10 million inhabitants, and the population is doubling every 10 years. Current agriculture on Demographica could feed 20 million people, and technological improvement is expanding that capacity by 1 million every year. Given only this information, when will there be a food shortage on the island?

answer

In 20 years

question

Slash and Burn agriculture refers to

answer

resource based agriculture

question

Irrigation of plants refers to

answer

artificial addition of water

question

Which of the following would lead to an increase in per capita demand for food

answer

I and III (lower food prices, rising expectations of the populace)

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