Food And Agriculture Online Test

Flood irrigation is the least efficient method, losing significant water to evaporation and runoff. This excess water can cause soil salinization as dissolved salts accumulate when water evaporates from the soil surface. Drip and trickle irrigation are far more efficient, and center pivot is intermediate in efficiency.

Mechanized food production generally leads to environmental degradation and health risks associated with chemicals, but lower death rates are a positive societal outcome, not a negative impact of the production method itself.

The Green Revolution focused on increasing agricultural productivity through the use of high-yield crop varieties (often GMOs), synthetic fertilizers, and chemical pesticides.

Excessive irrigation causes water to evaporate, leaving dissolved salts behind in the soil. This process, called salinization, reduces soil fertility and can permanently degrade farmland. Note: the option has a typo (should be 'salinization' not 'salanization').

Integrated Pest Management (IPM) uses biological controls like pheromones to disrupt insect mating cycles, reducing the need for chemical pesticides. This is an ecologically friendly approach that targets specific pests while minimizing environmental harm.

Monocultures lack genetic diversity, meaning that if a specific pest or disease evolves to attack that crop, it can spread rapidly through the entire field without resistance.

Corn, rice, and wheat are the three most widely consumed staple crops globally, providing the majority of calories for the human population.

GMOs (Genetically Modified Organisms) are crops engineered with traits like pest resistance (Bt corn) or herbicide tolerance. This reduces pest damage and chemical use. Note: option C has a typo (should be 'Genetically' not 'Geneticall').

Inorganic fertilizers from Midwestern farms wash down the Mississippi River, carrying nitrogen and phosphorus into the Gulf of Mexico. This causes algal blooms that deplete oxygen, creating a 'dead zone' (hypoxia) where marine life cannot survive. Note: option D has a typo ('Gulf' misspelled as 'Guld').

Inorganic fertilizers are water-soluble and can be quickly leached from soil by rain or irrigation before plants absorb them. This wastes money, pollutes waterways, and requires frequent reapplication. Organic fertilizers release nutrients more slowly. Note: option B has a typo ('easy' misspelled as 'esay').

High-density fish farming often leads to the spread of parasites like lice and various bacterial infections due to the crowded conditions of the fish.

Global fish catch peaked around 1990 and has declined or stagnated due to overfishing - we are harvesting faster than fish populations can reproduce. Many fisheries have collapsed. Demand and prices remain high. Note: option A has a typo ('usage' misspelled as 'useage').

Leaving crop residue on the field protects the soil surface from wind and water, which significantly reduces soil erosion.

Biomagnification is the process where the concentration of toxins, such as pesticides, increases as they move up the food chain.

Rachel Carson's 1962 book 'Silent Spring' documented the devastating effects of DDT on birds and ecosystems, sparking the modern environmental movement. It led to DDT bans and inspired environmental regulations. DDT was a widely used pesticide that caused eggshell thinning in birds.

Crop rotation involves alternating the types of crops grown in a field each season to improve soil health and break pest cycles.

Traditional subsistence agriculture relies on human and animal labor rather than machinery. It produces food primarily for the farmer's family rather than for sale. This contrasts with industrial agriculture which uses heavy equipment and chemical inputs. Note: question has formatting typo ('agriculture' appears twice).

Industrial agriculture is defined by the use of heavy machinery, large-scale production, and standardized processes to maximize output.

Monoculture is the agricultural practice of growing a single crop species or variety over a large area.

Famine is defined as an extreme scarcity of food. Marasmus and Kwashiorkor are specific types of protein-energy malnutrition, while over-nutrition refers to excessive intake of nutrients.

Tropical rain forest soils are nutrient-poor because the rapid cycling of nutrients means most organic matter is stored in the biomass rather than the soil. When the forest is cleared, the nutrient cycle is broken and the soil quickly loses its fertility.