13266904
Description
Flashcards by Somto Ibeme, updated more than 1 year ago
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Created by Somto Ibeme
about 6 years ago
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| Question | Answer |
| What affects the rate of decay? | temperature (decompose quicker, increase enzyme rate) water oxygen no. of decay organism |
| What is compost? | decompose organic matter, natural fertiliser |
| What is biogas? | anaerobic decay of waste material, methane, burned for fuel, generate electricity |
| What is biodiversity | variety of different species of organisms within an ecosystem |
| What affects biodiversity? | deforestation (loss of habitat) global warming water pollution (fertiliser, eutrophication) land pollution (pesticides/herbicides) air pollution |
| high diversity | rain forests, woodlands |
| low diversity | deserts and polar reigons |
| What is food security? | having enough food to feed a population |
| What affects food security? | world population/birth rate increasing diets in developed countries change (demand for scarce food, imported) new pests/pathogens environmental conditions (drought), widespread famine high input costs (seeds, machinery, livestock) hard to maintain |
| How can fish populations be conserved? | fishing quotas (limits on no. and size of fish that can be caught tin areas) net size/mesh (reduce no of unwanted/discarded fish (ones accidentally caught) allow them to escape |
| How is mycoprotein created? | fungus Fusarium, aerobic conditions warm H2O out/cold H20 in, control temp steam (kill unwanted bacteria) paddles (prevent waste building up) CO2 taken, more CO2, less O2, less yield |
| How to create insulin from bacteria? | introduced gene for human insulin grow bacteria in vat collect to treat diabetes |
| Advantages of single celled protein: | no animal welfare issue cultured on waste materials overcomes issue with limited land space |
| Disadvantages of single celled protein: | long process (need to purify protein, less efficient) flavour different from traditional protein |
| How does fishing affect biodiversity? | other fish and dolphins, rays and sea turtles caught in nets, killed/injured more chance of being caught by predator struggle to provide for itself |
| What is agriculture used for? | grow crops for food (livestock/humans) rear animals to be killed for food rear animals for food products (eggs) grow crops for fuel (biofuels) |
| What is monoculture? | only growing one type of crop |
| Advantages of monoculture: | save money on wages |
| Disadvantages of monoculture: | if one pest affects one crop, whole crop field gone damage soil and remove nutrients |
| Advantages of crop rotation: | replenish nitrogen quantity in soil, repairing |
| What is biotechnology? | use living organisms to develop and make products genetic modification, cloning |
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