Investigating the population size of a plant species using random sampling

Question 1

step 1

Answer 1

Collect two numbers, one from each bag

Question 2

step 2

Answer 2

Use the numbers and the tape measures to locate the first position for your quadrat.

Question 3

step 3

Answer 3

Lay the quadrat on the ground

Question 4

step 4

Answer 4

Replace the numbers in the bags

Question 5

step 5

Answer 5

Count and record the number of the chosen plant species inside the quadrat.

Question 6

step 6

Answer 6

Repeat steps 1–5 until you have recorded the numbers of chosen plant species in ten
quadrats.

Question 7

estimated population size =

Answer 7

total area
____________
area sampled × number of plantain counted

Question 8

how do you calculate the total population size from quadrat data?

Answer 8

multiply the mean number in quadrat by total area of habitat

Question 9

why is it important to use enough quadrats?

Answer 9

larger sample size and calculating mean will increase validity of results

Question 10

when would you choose to use a quadrat or transect?

Answer 10

quadrat used to estimate population size whilst transect to measure distribution

Question 11

accuracy of measurements-is it 100% accurate if not why?

Answer 11

no it is a sampling technique that will give an estimate that should be close to the true value but there will be uncertainty
-counting every organism in a large area too time consuming and difficult

Question 12

how could you improve this method ?

Answer 12

ensure quadrats randomly placed to avoid bias
use more quadrats
use larger quadrats

Question 13

why are these sampling methods unsuitable for animals?

Answer 13

may move or hide