Distribution of Organisms Flashcards
What term is used to describe ‘living’ factors that affect the distribution of organisms?
Biotic
What term is used to describe ‘non-living’ factors that affect the distribution of organisms?
Abiotic
State 5 biotic factors that can affect the distribution of organisms.
competition, disease, predation, grazing and food availability.
State 4 examples of abiotic factors that affect the distribution of organisms.
light intensity, temperature, pH and moisture.
Name the piece of equipment used to measure temperature.
Thermometer
Name the piece of equipment used to measure light intensity.
Light meter
Name the piece of equipment used to measure moisture.
moisture meter
Name the piece of equipment used to measure pH
pH meter
State one possible error when using a moisture meter.
- Putting it in to different depths 2. Not wiping the probe between readings
State one possible error when using a light meter.
Accidentally casting a shadow
Name the equipment used to sample plants
Quadrat
When using a quadrat, what do you count?
The number of squares a plant is found in
What is used to sample small insects in an area?
A pitfall trap
When sampling, why is it important to take many readings?
Increases the reliability of your results
What are paired statement keys used for?
To identify organisms
What name is given to a species that by its presence of absence gives an indication to the level of pollution?
Indicator species
Why is it important to check pitfall traps regularly?
to avoid animals escaping or being eaten before they are counted
Why are roofs put on pitfall traps?
to keep out the rain, to make it dark, to prevent birds from eating the insects
