Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
|
How has modern technology resulted in increased food production? |
-agricultural machinery to use larger area of land and improve efficiency -chemical fertilisers to improve yields -insecticides to improve quality and yield -herbicides to reduce competition with weeds -selective breeding to improve production by crop plants and livestock |
|
|
Describe the negative impacts to an ecosystem of large-scale monoculture of crop plants |
? |
|
|
Describe the negative impacts on an ecosystem of intensive livestock production |
-animals' wast is washed out of sheds with water forming a slurry, if this slurry gets into streams and rivers it supplies an excess of nitrates and phosphates, which can lead to eutrophication -soil erosion if animals overgraze |
|
|
Describe the reasons for habitat destruction |
increased area for food crop growth, livestock production and housing extraction of natural resources marine pollution |
|
|
Effects of deforestation |
-animals living in the forest lose their homes and sources of food -species of plant become extinct as the land is used for other purposes -soil erosion is more likely as there are no tree roots to hold the soil in place -flooding becomes more frequent, no soil to absorb and hold rainwater -carbon dioxide builds up in atmosphere, as there are fewer trees to photosynthesise, increasing global warming |
|
|
Sources of pollution of land and water |
insecticides herbicides -herbicides can leak from farmlands into water systems where they can kill aquatic plants, removinf producers from food chain, herbivores lose food source and migrate, so carnivores also lose food source nuclear fallout -result of a leak from nuclear power station or from a nuclear explosion |
|
|
Sources of pollution of water |
chemical waste discarded rubbish -waste disposal is a problem due to increasing population, absense of effective means of disposal of rubiish can cause diseases untreated sewage fertilisers |
|
|
Sources of pollution of the air |
methane and carbon dioxide -enhanced greenhouse effect -climate change |
|
|
Effects of acid rain |
buildings -limestone and mortar dissolve plants -reduces growth and damages leaves soil -dissolves out aluminium salts in soil |
|
|
Causes of acid rain |
sulfur dioxide and nitrogen oxides are released into the air, where they mix and react with air
|
