Sampling

Question 1

Describe sources of error when using a Quadrat to sample

Answer 1

Not placed at random

Too few samples taken

Question 2

Describe sampling using a Pitfall trap

Answer 2

Measures the abundance of soil invertebrates
Smooth vertical sides
Container left for invertebrates to fall in

Question 3

Describe sources of error when using a pitfall trap to sample

Answer 3

Invertebrates may eat each other

Too few samples taken

Question 4

Describe the sampling of light intensity

Answer 4

Light meter
Hold or place in path of light source
Read scale and record reading

Question 5

Describe sources of error when sampling light intensity

Answer 5

Caring a shadow across light meter

Question 6

Describe the sampling of soil moisture

Answer 6

Soil moisture
Push prove all the way into the soil
Take reading and record result

Question 7

Describe the sampling of Soil temperature

Answer 7

Soil temperature thermometer
Loosen soil
Push in
Read scale and record

Question 8

Describe sources of error when sampling soil moisture

Answer 8

Wipe with dry cloth between uses

Question 9

Describe sources of error when sampling soil temperature

Answer 9

Hold by top so body heat doesn’t affect results

Question 10

Describe sampling using a Quadrat

Answer 10

Square of known area divided into smaller squares
Measures abundance of plants and slow animals
Placed randomly
Squares counted and recorded