Exam 9: The Underpinnings of Agriculture

Use the accompanying figure to answer the following question. -What is the approximate minimum percent sand a soil can have and still be considered "sandy loam"?

pH influences __________________

Tommy and Teagan are learning the process of good home gardening and decide to help their parents as best as they can.Every day they walk along rows of bean plants,carefully inspecting each plant for harmful insects,and removing any that they find.However,the bean plants do not grow well,and few beans form.Their parents notice the poor beans,inspect the plants and soil,and tell the children that walking around the plants every day has hurt the plants by __________________

Discuss how grazing practices can affect soil quality.

__________________ is the buildup of salts in soils,often as a result of overirrigation.

A soil deficient in humus would have __________________

Until about 10,000 years ago,our species depended on __________________

Decomposers are most likely found in the __________________.

The horizon where leached minerals and organic matter accumulate is called the __________________

Leaching __________________

__________________ is the federal agency responsible for preventing soil erosion and protecting waterways in agricultural areas of the United States.

Which of the following is pollinated by bees?

We lose 5 to 7 million hectares of productive cropland per year to __________________

Most rangeland in the U.S.is managed by __________________

__________________ refers to the agricultural practices in which the members of a farming family produce only enough food for their family's own subsistence and do not make use of large -scale irrigation,chemical fertilizer,or machinery and technology.

Erosion can result in a positive feedback loop because __________________

Identify and discuss at least three practices used by farmers to protect their soils.

Read the following scenario and answer the question below. Early People and Agricultural Beginnings: Long ago, two sisters were talking as they returned from their morning trip to collect mushrooms, seeds, berries, and green le the day's meals. The younger woman was watching the progress of a small rabbit as it hopped across the path and toward the trash midden (refuse heap), where broken tools (made of bone, stone, or shell) were tossed, and where discarded food was thr She noticed the rabbit stop and begin nibbling at the many new, green shoots sprouting across one side of the midden. She wa over to look, and she saw that some of last year's discarded dried fruits were growing. Surprised and interested, she called he over to discuss this find. -Twenty years have passed since the young woman first noticed seeds sprouting in the midden.Which of the following could now be TRUE?

The breakdown of large rocks into smaller pieces is __________________

Use the accompanying figure to answer the following question. -Soil that is 30% silt could be classified as any of the following EXCEPT .