Sampling Organisms RPA Flashcards
1
Q
How to estimate total population of daisies in a field
A
- 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
2
Q
Total population size
A
Total area/ area samples X number of organisms of that species counted in sample
3
Q
How to measure the effect of a factor on the destitution of a species
A
- 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
4
Q
Why is there a greater number of daisies away from the tree
A
Under tree there’s a lower light intensity
Tree absorbs a lot of water and minerals from the soil
