B19 - Human influences on ecosystems Flashcards
ecosystem definition
a unit containing the community of organisms and their environment, interacting together
biodiversity definition
the number of different species that live in an area
reasons for habitat destruction (3)
increased area for housing, crop plant production and livestock production
extraction of natural resources
freshwater and marine pollution (eutrophication)
effects of deforestation (5)
reduces biodiversity
extinction
loss of soil
flooding
increase of carbon dioxide in the atmosphere
ecology definition
the study of ecosystems
habitat definition
the area where an organism lives
community definition
all the populations of all the different species living in the same habitat
types of freshwater pollution(6)
untreated sewage
chemical waste
discarded rubbish
fertilisers
insecticides and herbicides
nuclear fall-out
pesticides definition and examples
poisonous chemicals which kill pests
insecticides kill insects
fungicides kill fungi
pesticides are used to kill weeds and caterpillars eating our food crops
what is DDT and where is it stored in the body
DDT is an insecticide
it is stored in fatty tissue
increased land use examples (5)
housing
crop farming
livestock farming
urbanisation
quality of soil
extraction of natural resources examples (5)
wood
stone
metal
gems
coal
marine pollution examples (7)
oil spills
carbon dioxide
eutrophication
sewage
chemicals
rubbish
plastic
chemical waste examples (4)
bioaccumulation
DDT
mercury
pesticides
reasons why organisms are endangered (5)
climate change
habitat destruction
hunting
pollution
introduced species
