sampling

Question 1

non-random sampling

Answer 1

samples are taken at predetermined points
e.g, every 10m along a straight line

Question 2

random sampling

Answer 2

where samples are taken at random

Question 3

the more samples taken…

Answer 3

the more accurate the estimate of the total population size

Question 4

change in plant cover across a footpath using a transect

Answer 4

1) lay tape in a straight line covering a fixed distance either side of a footpath
2) select sites along the tape to take samples
3) place a quadrat at the first sample site. note the number of plant species in the quadrat
4) record any important abiotic factors at the sample site (e.g, moisture content )
5) retreat procedure for remaining sampling sites
wash hands after

Question 5

measuring abiotic factors

Answer 5

digital sensors provide a quick way to note any changes to abiotic factors between sampling locations
sensors should be regularly calibrated to ensure they provide a true reading