Sampling

Question 1

Define an abiotic factor

Answer 1

An abiotic factor is a non-living physical factor that can affect the distribution of organisms

Question 2

What are some example of abiotic factors ?

Answer 2

Light intensity
Temperature
Ph
Moisture

Question 3

Define a biotic factor

Answer 3

A biotic factor are living factors that can affect the distribution of organisms

Question 4

What are some examples of biotic factors ?

Answer 4

Predation
Disease
Grazing
Competition for food

Question 5

What are potential sources of error when using a quadrat ?

Answer 5

Quadrats are not placed randomly
Too few quadrats used
Plants miscounted

Question 6

What are potential sources of error when using a pitfall trap ?

Answer 6

Insects do not fall into trap
Insects eat each other
Trap fills with rain water
Insects are eaten by predators
Insects drown

Question 7

How would you minimise error of insects not falling in the trap ?

Answer 7

Make sure top is level with soil

Camouflage the trap

Question 8

Describe how you would measure light intensity

Answer 8

Use a light meter, hold the sensor out from the body and avoid shadows