Organisms and their environment Flashcards
energy is stored in the _________ of an organism
biomass
what is a trophic level
feeding levels in a food chain
what is a producer
an organism that makes its own food
what is biodiversity
the variety of living organisms in an area
what is fish farming
growing one kind of fish in an area to farm
what are 2 cons of fish farming
- the waste can pollute the local area, possibly changing the conditions
- diseases from farmed fish can spread to wild fish
what is the benefit of fish farming
reduces farming to wild fish
what is a non-indigenous species
an organism that is not found naturally in the area but may be introduced into it
what are 2 negatives of non-indigenous species
may not have any natural predators
may out-compete other species
what a positive of non-indigenous species
may provide food for native species
what eutrophication
when fertilisers are added to crops get into streams and river
explain eutrophication and the effects of it in 5 steps
- eutrophication causes water and plants to grow more quickly
- plants and algae cover the surface and block light into deeper water
- deeper plants cannot get slight so they die
- bacteria decompose dying plants taking oxygen from the water
- the lack of oxygen kills fish
what are 4 reasons for maintaining biodiversity and what an explanation for both
- moral reason: humans should respect other living organisms
- aesthetic reasons: people enjoy singing a variety of other living organisms
- ecosystem structure: some organisms play a vital role in their ecosystem
- usefulness: some species are useful to humans for example plants that produce medicines
what is reforestation
replanting forests where they have been destroyed
what are 4 advantages of reforestation
restores habitats for species that are endangered
reduces the concentration of CO2
tree roots bind the soil together
helps local climate and reduces the temperature variation
