Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

18 Cards in this Set

  • Front
  • Back
  • 3rd side (hint)
Poor health condition caused by not consuming enough necessary food.
What is Malnutrician? p228
Ex. Prevalent in Bangladesh, Sri Lanka, & 3rd world countries. Poor agriculture is one cause.
A period when rainfall is less than average, causing crop failure.
What is Drought? p229
Ex. One of the causes of the 7 plagues of Egypt during the Exodus of Jews by Moses.
A widespread food shortage.
What is Famine? p.229
Ex. One the results of Drought or Locusts.
The amount of crops produced per unit area of land.
What are Yields? p.229.
Ex. Increases with modern farming methods & good weather.
Farmers who grow only enough food for their family.
What are Subsistence Farmers?
Has low yield due to not using chemicals & modern equipment and methods.
Fertile land that can be plowed to grow crops.
What is Arable Land? p.231
The shortage of this threatens our ability to feed the human population.
The loose surface layer of soil.
What is Topsoil? p. 232
Soil where roots of plants grow composed of rock particles, water, air, and organic matter.
The wearing away of topsoil by wind and water.
What is Erosion? p.234
About one-half of the topsoil in the U.S.A. has been lost to this in the last 200 yrs.
The clearing of trees from an without replacing them.
What is Desertification? p235.
Worldwide an area the size of Nebraska becomes desert-like by this process annually.
A procedure in which the seeds of the next crop are planted in slits cut into the soil through remains of the previous crop.
What is No-Till Farming? p.237
Uses refuse of old crop to rot providing nutrients for new crop
Farming that does not use a lot of energy, pesticides, fertilizer, and water
What is Low Input Farming?
Ex. Organic Farming w/o pesticides or synthetic chemicals replacing it with organic matter (manure, compost); Fish-farming
Any organisms that are not wanted or that exists in large enough number to cause damage.
What is a Pest? p.240.
Ex. Locusts, caterpillars, bees, fungus, rats, weeds, insects,
A substance that kills pests.
What is a Pesticide? p.241.
Ex. DDt, Lindane, Carbayl, Zectran ,
The ability of the pest population to tolerate a particular pesticide.
What is Tolerance? p.241.
Eolving by genetic mutation to resist pesticides.
Pest control using living organisms or naturally produced chemicals.
What is Biological Pest Control? p.243.
The bacteria Bacillus thuringensis can contro Gypsy Moth caterpillars.
Disease-causing organisms , such as bacteria, viruses, and parasites.
What are Pathogens? p. 244
Bt or Bacillus thuringensis is an example used to kill the Gypsy Moth caterpillar.
Soil that supports the rapid growth of healthy plants.
What is Fertile Soil? (232)
Composed of rock particles, water air, and organic (humus,peat, dead animals/plants) matter,& animal excrement (manure).
The accumulation of salts in the soil.
What is Salination? (238)
Due to over irrigation of land leaving salts behind in soil when the water evaporates or by causing the groundwater to rise up depositing salts.