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Explain why organisms become endangered or extinct, including: climate change, habitat destruction, hunting, overharvesting, pollution and introduced species
1 Answer State that some resources can be conserved and managed sustainably, limited to forests and fish stocks
1 Answer Describe a sustainable resource as one which is produced as rapidly as it is removed from the environment so that it does not run out
1 Answer Explain the process of eutrophication of water, limited to: • increased availability of nitrate and other ions • increased growth of producers • increased decomposition after death of producers • increased aerobic respiration by decomposers • reduction in dissolved oxygen • death of organisms requiring dissolved oxygen in water
1 Answer Describe the sources and effects of pollution of the air by methane and carbon dioxide, limited to: the enhanced greenhouse effect and climate change
1 Answer Describe the effects of non-biodegradable plastics, in both aquatic and terrestrial ecosystems
1 Answer Describe the effects of untreated sewage and excess fertiliser on aquatic ecosystems
1 Answer Describe the advantages and disadvantages of intensive livestock production
1 Answer Describe the advantages and disadvantages of large-scale monocultures of crop plants
1 Answer Describe how humans have increased food production, limited to: (a) agricultural machinery to use larger areas of land and improve efficiency (b) chemical fertilisers to improve yields (c) insecticides to improve quality and yield (d) herbicides to reduce competition with weeds (e) selective breeding to improve production by crop plants and livestock
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Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan