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biology 0610printed 289 · PDF 289
328 pagesrevision 46933
printed 289 · PDF 289
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Core
1 Describe biodiversity as the number of different
species that live in an area
2 Describe the reasons for habitat destruction,
including:
(a) increased area for housing, crop plant
production and livestock production
(b) extraction of natural resources
(c) freshwater and marine pollution
3 State that through altering food webs and food
chains, humans can have a negative impact on
habitats
4 Explain the undesirable effects of deforestation
as an example of habitat destruction, to include:
reducing biodiversity, extinction, loss of soil,
flooding and increase of carbon dioxide in the
atmosphere
Supplement
Core
1 Describe the effects of untreated sewage and
excess fertiliser on aquatic ecosystems
2 Describe the effects of non-biodegradable
plastics, in both aquatic and terrestrial
ecosystems
3 Describe the sources and effects of pollution of
the air by methane and carbon dioxide, limited
to: the enhanced greenhouse effect and climate
change
Supplement
4 Explain the process of eutrophication of water,
limited to:
e 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
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