Unit 11 Exam Review: Soil and Agriculture

About how much of Earth's and surface is used for agriculture?

• 8 percent

• 18 percent

• 28 percent

• 38 percent

The organic matter in soil includes

• minerals.

• living and decomposing organisms.

• living organisms only.

• bedrock.

Crop rotation does all of the following EXCEPT

• minimize erosion.

• let fields lie fallow.

• return nutrients to the soil.

• break cycles of diseases.

Which soil conservation technique is shown in the photo?

• reduced tillage

• shelterbelts

• contour farming

• terracing

Arid and semiarid lands are prone to desertification because

• the Sahara is expanding.

• gigantic dust storms blow sand from China into North America.

• the precipitation cannot meet the growing human demand of water.

• 10 percent of productivity is lost to erosion.

Traditional agriculture may use all of the following EXCEPT

• teams of work animals.

• irrigation.

• fossil fuels.

• organic fertilizer.

Efficient industrial agriculture requires that large areas be planted with

• contoured and well-plowed fields.

• single crops.

• native organisms.

• cover crops.

Because of the green revolution, between 1961 and 2008, food production

• increased 150 percent while the population doubled.

• kept pace with population growth.

• did not increase.

• was mostly organic.

A secure food supply depends on all of the following EXCEPT

• maintaining healthy soil and water.

• increased use of fertilizer.

• safe distribution of the food.

• biodiversity.

Industrial food production includes

• aquaculture

• monocultures

• feedlots

• all of them.