Sampling Organisms RPA

Question 1

How to estimate total population of daisies in a field

Answer 1

• use random sampling
• place 2 tape measures that are 20m in length
• 2 bags, each bag contains the numbers 1-20
• person 1 takes a number from the bag
  Eg 8
• person moves to 8m on one of the tape measures
• person 2 does the same eg 12
• person 3 places quadrat at 8 by 12
• students recorded number of daisies in first quadrat
• repeat 9 times

Question 2

Total population size

Answer 2

Total area/ area samples X number of organisms of that species counted in sample

Question 3

How to measure the effect of a factor on the destitution of a species

Answer 3

• place a tape measure at the factor eg a tree
• use quadrat to count number of daisies at start of transect
• record light intensity at this point
• live quadrat 1m down tape measure
• repeat until tape measure covered

Question 4

Why is there a greater number of daisies away from the tree

Answer 4

Under tree there’s a lower light intensity
Tree absorbs a lot of water and minerals from the soil