distribution and biodiversity

Question 1

how is a field set up for random sampling

Answer 1

by laying two tape measures at right angles on the field to set up a coordinate system

Question 2

how do students decide where the quadrats are placed

Answer 2

by using a random-number generator to produce coordinates. place quadrat down at the coordinates using the tape measure as a guideline

Question 3

what are the controlled variables of this practical

Answer 3

1. size of quadrat
2. coordinate system
3. number of quadrats per site
4. area of sites

Question 4

why does a random number generator need to be used

Answer 4

to avoid bias in random sampling

Question 5

when is a transect used

Answer 5

when there is an ecological gradient in the sampling area

Question 6

describe the practical of using a transect line

Answer 6

1. lay down a tape measure along the ecological gradient
2. place the quadrat at the 0 mark record the number of required species
3. repeat the process 5m up the tape measure until the end of the transect
4. plot a graph of number of individuals against the selected factor