SB9a Ecosystems Flashcards
what do organisms need to survive? 4
light - plants
food - animals
water - plants + animals
oxygen - plants + animals
ecosystem?
all the organisms and the environment in which they live
community?
all the organisms that live and interact in an ecosystem
population?
individuals of species that makeup a community
interdependant?
species in a community that depend on each other for resources
habitat?
where a organism lives within an ecosystem
how can you estimate a population size?
taking samples using a quadrat
population size =
number of organisms in all quadrats x total size of area / total area of quadrats
what do food webs show?
the feeding relationship between the organisms in a community
biodiversity?
the number of different species living in an ecosystem
how can organism distribution be measured?
belt transect
how are belt transects used?
quadrats are placed at one metre intervals and the number of organisms in each quadrat is counted, along with the abiotic factors
