Describe how endangered species can be conserved, limited to: (a) monitoring and protecting species and habitats (b) education (c) captive breeding programmes (d) seed banks
1 Answer 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
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