Ecosystems and humma impact Flashcards
what is the main energy source for all living things
light energy from the sun
what is biomass
the mass of living material in plants and animals
what the energy from the sun used for and why
photosynthesis, to produce substances that become part of the cells, increasing biomass
producer
makes its own food by photosynthesis
consumer
an organism that eats other organisms
first stage consumer
the first organism that is eating in a food chain
second and third stage consumers
the second and third organisms that’s eating in food chain
herbivore
only eats plants
carnivore
only eats animals
omnivore
eats both animals and plants
what do the arrows in a food chain show
it shows the flow of energy being passed from one living thing to the next
what is a tertiary consumer
the top predator in a food chain (only feeds on secondary consumers)
if all rabbits died how would that effect foxes
they would decrease in numbers bc they have less food to eat
if there were less rabbits how would that effect lettuce production
number of lettuce would increase bc there are less rabbits eating it
how would mice be affected if all rabbits die
the number of mice would decrease bc foxes would have less rabbits to eat and therefore eat more mice
why do animals lose more heat than plants
bc their metabolism is higher and they move around
( warm blooded animals lose more eat bc they have to keep their body temps consistent)
( land animals lose more energy than water animals bc water animals don’t have to support their bodies they just float)
food pyramids- pyramid of number
they show the number of organisms in a given area or volume for every feeding level
what are the rules for pyramids of number
the producer is always at the bottom
the size of every block shows the number of plants or animals in the food chain
what does a pyramid of biomass show
it shows the dry mass of organisms in a given area or the volume for every feeding level ( pyramids if biomas should i always be pyramid shaped)
how do we calculate trophic efficiency
energy in later stage divided by
energy in earlier stage
then x by 100
why are habitats being destroyed
housing
industry
agriculture
deforestation
environmental impact assessment and why is it used
it’s used to decide whether the development should be allowed refused or modified to reduce the effect on wildlife
advantages and disadvantages of fertiliser
ad- increase plant yield
dis- can wash out of soils and cause rapid growth of plants and algae in rivers and streams
name four methods of intensive farming
fertilisers
pesticide
disease control
battery methods
