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Creado por Somto Ibeme
hace más de 6 años
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Pregunta | Respuesta |
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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