B16 - sampling RP

Question 1

what must you do after fieldwork in the sampling required practical

Answer 1

wash your hands

Question 2

what is the method for random sampling to investigate population size

Answer 2

1. lay 2 tape measures in sample area at right angles
2. use a random number generator to generate coordinates
3. at the coordinates, lay the quadrat down and count the number of individual plants of one species in the quadrat
4. repeat this process a number of times and work out the mean number of plants in metres^2
5. measure the area of the whole habitat and multiply the number of plants by the whole area

Question 3

what is the method for investigating distribution using a transect

Answer 3

1. lay a tape measure (the transect) across the area to be investigated
2. place the quadrat down at regular intervals along the tape measure
3. count the number of individual plants of one species in the quadrat
4. repeat the transect in a different area at least twice more

Question 4

why is sampling carried out

Answer 4

counting all of the individuals of a species can be difficult and time consuming. sampling should be representative of the whole area