AQA Biology B16 EXAM Questions and
Answers 100% Solved | Rated A+
Define Community - ✔✔A group of independent living organisms in an
ecosystem
Define Population - ✔✔All members of a single species that live in a habitat
Define habitat - ✔✔The place where an organism lives
Define Ecosystem - ✔✔A habitat and its community
Define abiotic factor - ✔✔A non living thing or factor that affects an
ecosystem
Define biotic factor - ✔✔A living thing that affects an ecosystem
Describe a stable community - ✔✔One in which environmental factors are
stable causing the populations of the various species to be stable e.g.
tropical rain forests, coral reefs
Define interdependence - ✔✔A situation in which if one thing is removed
from an ecosystem another is directly affected by it e.g. all grass being
removed from a field of cows
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, List some Abiotic factors (9) - ✔✔light intensity
temperature
moisture levels
soil pH
soil mineral content
wind intensity
wind direction
carbon dioxide levels
availability of oxygen
List some Biotic factors (4) - ✔✔Availabilty of food
new predators arriving
new pathogens
new competitors
State the function of a quadrat - ✔✔Used to investigate the size of a
population of plants, gets a rough average of plants per sq (quadrat size)
How to estimate a population size with quadrats and transects -
✔✔Transect is laid out, at regular intervals quadrat samples are taken, find
a mean and then take that mean and scale it up for the entire area
What do animals compete for - ✔✔Food
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
Answers 100% Solved | Rated A+
Define Community - ✔✔A group of independent living organisms in an
ecosystem
Define Population - ✔✔All members of a single species that live in a habitat
Define habitat - ✔✔The place where an organism lives
Define Ecosystem - ✔✔A habitat and its community
Define abiotic factor - ✔✔A non living thing or factor that affects an
ecosystem
Define biotic factor - ✔✔A living thing that affects an ecosystem
Describe a stable community - ✔✔One in which environmental factors are
stable causing the populations of the various species to be stable e.g.
tropical rain forests, coral reefs
Define interdependence - ✔✔A situation in which if one thing is removed
from an ecosystem another is directly affected by it e.g. all grass being
removed from a field of cows
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, List some Abiotic factors (9) - ✔✔light intensity
temperature
moisture levels
soil pH
soil mineral content
wind intensity
wind direction
carbon dioxide levels
availability of oxygen
List some Biotic factors (4) - ✔✔Availabilty of food
new predators arriving
new pathogens
new competitors
State the function of a quadrat - ✔✔Used to investigate the size of a
population of plants, gets a rough average of plants per sq (quadrat size)
How to estimate a population size with quadrats and transects -
✔✔Transect is laid out, at regular intervals quadrat samples are taken, find
a mean and then take that mean and scale it up for the entire area
What do animals compete for - ✔✔Food
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
