what does biotic factors mean
living factors which can affect the size of a population
what does abiotic factors mean
non living factors which can affect the population size
name 5 abiotic factors
- light intensity
- carbon dioxide conc
- oxygen conc
- temperature
- minerals ions
name the 4 biotic factors
- availability of food
- new predators
- competition
- new pathogens
pathogens are germs, tiny oganisms that cause illnesses
what does an acorn, squirrel and fox show
what is each organism called
what does the arrow show
food chain - the feeding relationship.
acorn -> squirrel -> fox
PRODUCER -> PRIMARY CONSUMER -> SECONDARY CONSUMER
the arrow is showing the direction of energy transferring
what 4 things do animals compete for??
- food
- shelter/territory
- mates
- water
what 4 things do plants compete for??
- water
- mineral ions
- space
- sunlight
describe how algae gets its energy
from sunlight absorbed by the chloroplasts
3 reasons biomass is lost
- the consumer cannot digest all parts from organisms it eats
- biomass lost when consumer respires and breathes out carbon d
- biomass lost through excretion
effects of laws on conervation of herrings - bad (3)
- could be other causes other than laws
- each law results in an increase followed by a decrease
- quotas lead to dead fish being thrown back into the sea
what is the process wheat plants use to make glucose
photosynthesis
