Distribution Of Organisms Flashcards
What is the definition of abiotic and biotic factors + examples
Biotic - living factors such as disease, food availability and predation
Abiotic - non living factors such as pH, light intensity and moisture
What do you use to measure light intensity
Light meter
Remember not to shade the meter
What do you use to measure soil moisture
Moisture meter
Remember to wipe to avoid contamination
What do you use to measure pH
pH meter
Remember to wipe to avoid contamination
What to use to measure temperature
Thermometer
Remember to wait for the reading to stabilise
What is a paired statement key?
It is a way to identify organisms, each pair of statements describe a feature of the organism in a wag that only gives two possible answers
Why do we use sampling techniques
Counting all the plants and animals would take too long so we estimate by sampling small areas
Samples should be both ……and……
Representative and reliable
Why should samples be representative
Samples should not be biased towards one conclusion
Why should samples be reliable
Repeat samples must be taken
What are the two main sampling techniques and describe them
Quadrat - a square of known area used to smoke immobile or slow moving organisms
Pitfall - a trap used to collect small mobile animals
