revison Flashcards
define ecosystem
a community of independent species and their environments
define renewable energy
energy that can be obtained from natural resources that can be constantly replenished E.G wind power
define sustianable development
development that meets needs of the present without compromising the needs of the future generarions
define greenhouse gas
a gas in the atmosphere that absorbs asn eliminates radiation such as carbon dioxide
what is the difference abiotic and biotic
the difference between abiotic and biotic is that that abiotic factors that are non living E.G water and air whereas biotic factors are living things such as animals and plants
organisms vs species
organisms are single living things whereas species are groups of organisms
decomposers
breakdown organic material and use the decomposition products to supply themselves with energy
consumers
Animals are consumers, that is they use the bodies of other organisms as a source of food energy.
producers
Plants are the major producers on land, while algae and certain types of bacteria are important producers in aquatic environments.
effects of removing an component from an ecosystem
- dispruts the flow of energy
- limits food for predators
- imbalance in the ecosystem
- reduce biosphere
- disstrubing habitat
effects of fire
fire can be very dangerous it can kill people, wipe out entire areas of trees and destroy houses. indigenous people relied heavily on fire for food
effects of floods
floods van be fatal they wipe our entire areas of vegetations animals and plants and destroy houses
primary succesion
when a community is established where it has never been before
secondary succesion
when a community is established where there has been previous vegetation
native vegetation
native vegetation is important because
- it provides habitats for native plants and animals
- reduces the impacts of greenhouse gases
- provides shade and shelter
- protects water Quilty
