GCSE BIOLOGY – ECOLOGY EXAM REVISION QUESTIONS WITH
VERIFIED SOLUTIONS LATEST 2025 UPDATE.
What does abiotic mean - ANSWER- Non living
What does biotic mean - ANSWER- Living
What are abiotic factors - ANSWER- Physical (non living) conditions that affect organism
distribution (population and habitat)
What are the abiotic factors? - ANSWER- Temp
Light intensity
Oxygen levels for plants and animals in water
Co2 levels for plants
Moisture (water)
Soil ph, mineral contents (plants)
Wind intensity and direction.
Define ecosystem - ANSWER- Interaction of a community (of living organisms) with abiotic
parts of their environment.
Give an example of an artificial ecosystem - ANSWER- Fish farms, and planted forests
Define biodiversity - ANSWER- Range of different plants and organisms in an ecosystem
What do decomposers do - ANSWER- Break down dead organisms
, Define population - ANSWER- Total number of species in an ecosystem
Define habitat - ANSWER- Place where an organism lives in the ecosystem
Define community - ANSWER- Total number of organisms in an area
How does a community differ from a population - ANSWER- A population is the total number
of one species in an ecosystem
Define interdependence - ANSWER- 2 or more organisms relying on one another
What are the biotic factors - ANSWER- Food availability
New pathogens
New predators
Competition between species
What are biotic factors - ANSWER- Caused by organisms and affecting other populations
interactions he ecosystems
How can grazing affect the distribution of different plant species - ANSWER- More plant
species grow as dominant plants are eaten by animals, so the weaker plants grow as they can get
more sunlight and minerals as they aren't being taken up by the dominant plants
What is a stable community - ANSWER- A community where the biotic and abiotic factors are
in balance with that the population sizes remain fairly constant.
Give an example of 2 stable communities - ANSWER- oak forest and tropical rainforests
What are teh different levels of organisation in an ecosystem - ANSWER- indiviudal organisms
VERIFIED SOLUTIONS LATEST 2025 UPDATE.
What does abiotic mean - ANSWER- Non living
What does biotic mean - ANSWER- Living
What are abiotic factors - ANSWER- Physical (non living) conditions that affect organism
distribution (population and habitat)
What are the abiotic factors? - ANSWER- Temp
Light intensity
Oxygen levels for plants and animals in water
Co2 levels for plants
Moisture (water)
Soil ph, mineral contents (plants)
Wind intensity and direction.
Define ecosystem - ANSWER- Interaction of a community (of living organisms) with abiotic
parts of their environment.
Give an example of an artificial ecosystem - ANSWER- Fish farms, and planted forests
Define biodiversity - ANSWER- Range of different plants and organisms in an ecosystem
What do decomposers do - ANSWER- Break down dead organisms
, Define population - ANSWER- Total number of species in an ecosystem
Define habitat - ANSWER- Place where an organism lives in the ecosystem
Define community - ANSWER- Total number of organisms in an area
How does a community differ from a population - ANSWER- A population is the total number
of one species in an ecosystem
Define interdependence - ANSWER- 2 or more organisms relying on one another
What are the biotic factors - ANSWER- Food availability
New pathogens
New predators
Competition between species
What are biotic factors - ANSWER- Caused by organisms and affecting other populations
interactions he ecosystems
How can grazing affect the distribution of different plant species - ANSWER- More plant
species grow as dominant plants are eaten by animals, so the weaker plants grow as they can get
more sunlight and minerals as they aren't being taken up by the dominant plants
What is a stable community - ANSWER- A community where the biotic and abiotic factors are
in balance with that the population sizes remain fairly constant.
Give an example of 2 stable communities - ANSWER- oak forest and tropical rainforests
What are teh different levels of organisation in an ecosystem - ANSWER- indiviudal organisms
