Topic 5

Question 1

Storages in soil

Answer 1

Organic matter, organisms, minerals, water, air, nutrients

Question 2

Transfers in soil

Answer 2

Biological mixing, movement of particles, leaching

Question 3

Transformations in soil

Answer 3

Decomposition, weathering, nutrient recycling

Question 4

What’s soil made from

Answer 4

Minerals from underlying rock, organic remains from dead plants and animals, water&air in between particles

Question 5

Most productive soil?

Answer 5

Loam

Question 6

Soil with lots of clay can

Answer 6

Leach nutrients and become acidic

Question 7

Soil with a lot of sand

Answer 7

Cannot hold water or nutrients

Low productivity

Question 8

Subsistent farming

Answer 8

Local

Question 9

Commercial farming

Answer 9

Big companies

Question 10

Extensive

Answer 10

Large area of land w low inputs

Question 11

Intensive

Answer 11

Small area of land w lots of inputs

Question 12

What’s affects our choice of crops

Answer 12

Climate, culture and religion, politics, socio-economic factors

Question 13

Monoculture

Answer 13

Species grown in high densities

Question 14

Efficiency of farming can be measured by

Answer 14

Energy contained between each crop

Efficiency of agricultural systems

Question 15

What causes decreases in land

Answer 15

Soil erosion, salinization, desertification, urbanization

Question 16

How to increase sustainability of food supplies

Answer 16

Improve technology, alter what we grow, go green

Reduce food waste-storage, consumption

Monitoring and control-regulations

Question 17

Causes of soil erosion

Answer 17

Sheet wash, gullying, wind erosion, overgrazing, overcropping, deforestation, urbanization

Question 18

Unsustainable agriculture techniques

Answer 18

Total removal of crops after harvest
Uncovered soil
Excessive pesticide use
Monoculture

Question 19

Soil conservation

Answer 19

pH conditioners
Wind reduction -fences, trees
Cultivation techniques-cover crops, terracing (reduce slope), contour farming