Distribution of Organisms Flashcards
What is meant by a biotic factor?
A LIVING FACTOR WHICH CAN AFFECT THE SIZE OF A
POPULATION
Examples of biotic factors
DISEASE / COMPETITION / PREDATORS / GRAZING / FOOD
What is meant by an abiotic
factor?
A NON—LIVING FACTOR WHICH CAN AFFECT THE SIZE OF A POPULATION
Examples of abiotic factors
pH / LIGHT INTENSITY / TEMPERATURE / MOISTURE
The function of sampling techniques
TO ESTIMATE THE NUMBER AND TYPE OF ORGANISMS IN AN
ECOSYSTEM
Reason why many samples are taken
TO IMPROVE RELIABILITY OF RESULTS
The sampling technique used to estimate the number of plants or slow moving animals in an area
QUADRATS
The sampling technique used to
estimate the number of
invertebrates in an area
PITFALL TRAP
A source of error which may occur when using a quadrat
NOT THROWING IT RANDOMLY
A source of error which may occur when using a pitfall trap
NOT CHECKING THE TRAP OFTEN ENOUGH
The piece of equipment used to measure light intensity and a source of
error which can occur from using this
LIGHT METER
- COVERING LIGHT, SHADING LIGHT SENSOR
The piece of equipment used to measure moisture meter and a source of error which can occur from using this
MOISTURE METER
- NOT CLEANING THE PROBE IN BETWEEN READINGS
The piece of equipment used to measure pH and a source of error which can occur from using this
PH METER
- NOT CLEANING THE PROBE IN BETWEEN READINGS
The piece of equipment used to
measure temperature and a source of error which can occur from using this
THERMOMETER
-TAKING READINGS BEFORE THE TEMPERATURE SETS IN
The term for an organism which can indicate pollution levels or
environmental quality by their presence or absence.
INDICATOR SPECIES
