sampling techniques(unit 3)

Question 1

what is random sampling

Answer 1

this means that each potential sample has the same probability of being selected. used when area under study is large, area under study is fairly uniform, there is limited time

Question 2

what are abiotic factors that can affect plant population

Answer 2

soil type/moisture/oh
topography, for example, steepness of slopes
weather/sunlight
temperature

Question 3

what is a quadrat

Answer 3

a quadrat us a small area of habitat(normally 1m2) which sometimes has a grid in it.

Question 4

how do you chose where to place a quadrat

Answer 4

1) draw a map of area
2) overlay a grid on the map
3) use a random number generator to decide where the quadrat is placed.

Question 5

what is a line transect

Answer 5

sampling lines are set up across the area to be sampled. species can be recorded along the whole length of the line this is continuous sampling

Question 6

what is belt transect

Answer 6

this is similar to a line transect but gives information the abundance of species
quadrats are placed at set intervals along the line and numbers of each species are counted within them.