Widespread starvation caused by a shortage of food.
One calorie is equal to 1,000 kilocalories.
When people do not consume enough calories. Major nutrients: carbohydrates, proteins, and lipids.
Sugars. Wheat, corn, and rice. 4 Cal/g. Main source of the body's energy.
Oils and fats. Olives, nuts and animal fats. 9 Cal/g. Helps form membranes and hormones.
Amino acids. Animal food and smaller amounts of plants. 4 Cal/g. Helps build and maintain all body structures.
The type and amount of food that he or she eats.
A measure of the quantity of food produced on a given area of land with inputs of energy and resources.
The amount of food that can be produced in a given area.
Farmers who grow only enough food for local use.
The Green Revolution
Between 1950 and 1970 when Mexico increased its production of wheat eight-fold and India doubled its production of rice without increasing the area of farmland used. It reduced the price of food and improved the lives of millions of people.
Land that can be used to grow crops.
Helps crops grow by mixing soil nutrients, loosening soil particles, and uprooting weeds.
Organic fertilizers such as manure are used to enrich the soil so that plants grow strong and healthy.
Fields are irrigated by water flowing through ditches.
Weeds are removed by hand or machine.
Soil that can support the growth of healthy plants.
The surface layer of soil. Usually richer in organic matter than the subsoil.
Composed of living organisms, rock particles, water, air, and organic matter such as dead and decomposing organisms.
When the minerals in the rock react chemically with substances such as water to form new materials. Temperature changes and moisture cause rock to crack and break apart, which creates smaller particles on which the seeds of pioneer plants fall and take root.
Fallen leaves and partially decomposed organic matter.
Organic matter, living organisms and rock particles.
Zone of leaching
Dissolved or suspended materials moving downward.
Larger rock particles with organic matter and inorganic compounds.
Rock that has undergone weathering.
Solid rock layer.
The movement of rock and soil by wind and water. Most farming methods increase the rate of soil erosion.
When human activity or natural processes damage the land so that it can no longer support the local ecosystem.
The process by which land in arid or semiarid areas becomes more desertlike.
To remain unplanted for several years.
Plowing across a slope of a hill instead of up an down the slope.
A crop harvested without turning over the soil in place while the new crop develops. Saves time.
Partially decomposed organic material.
The accumulation of salts in the soil.
Chemicals used to kill insects, weeds, and other crop pests.
The ability to survive exposure to a particular pesticide.
Pesticides that do not break down rapidly into harmless chemicals when they enter the environment. As a result, they accumulate in the water and soil. Some have been banned in the U.S, but many of them remain in the environment for many years. EX: DDT.
Biological pest control
The use of living organisms to control pests.
Bt. Can kill caterpillars of moths and butterflies that we consider to be pests.
Label that means they are resistant to certain fungi, worms, and viruses.
A chemical that interferes with some stage of a pest's life cycle. Stops the flea's eggs from developing into adult fleas.
Chemicals produced by one organisms that affect the behavior of another organisms, can also be used as pest control.
Integrated pest management
A modern method of controlling pests on crops. Steps: 1. Economic considerations or crop and pest ecology 2. Set action thresholds 3. Identify and monitor pests 4. Prevent pests 5. Control pests when necessary.
Technology in which genetic material in a living cell is modified for medical or industrial use. Involves isolating genes from one organism and implanting them into another.
Farming that conserves natural resources and helps keep the land productive indefinitely. Minimizes the use of energy. water, pesticides, and fertilizers.
Involves planting productive, pest-resistant crop varieties that require little energy, pesticides, fertilizers, and water.
They are bred and managed for human use. EX: Chicken, cheep, cattle, honey bees, silkworms, fish, and shellfish. Goats, pigs, and water buffalo may also be domesticated in other parts of the world.
Catching or removing from a population more organisms than the population can replace.
The raising of aquatic organisms for human use and consumption. Been around for 4,000 years.
Oyster farm/Fish farm
Consist of many individual ponds that each contain fish at a specific stage of development. Clean water is circulated through the ponds and brings in oxygen while sweeping away carbon dioxide and fecal wastes.
Domesticated animals that have been raised to be used on a farm or ranch or to be sold for profit.
Cud-chewing mammals that have three-four chambered stomachs. EX: Cattle, sheep and goats. Have microorganisms in their intestines which allow the animals to digest plant materials that humans cannot digest.
The food that these animals regulate from the first chamber of their stomachs and chew again to aid digestion.