3.2 DISTRUBUTION OF ORGANISMS

Question 1

Abiotic

Answer 1

Non living factor that affects a population

Question 2

Biotic factor

Answer 2

Living factor that affects a population

Question 3

Abiotic factor example

Answer 3

Light intesitu
Moisture
Ph
Temperature

Question 4

Biotic factor example

Answer 4

Competition for resources
Disease
Grazing
Predation

Question 5

How can abiotic factors be measured

Answer 5

Light intensity-light meter

Soil ph-Ph probe

Temperature-thermometer

Soil moister-moisture meter

Question 6

Abiotic factors sources of error

Answer 6

LIGHT INTENSITY
shading the meter

PH PROBE
Probes not cleaned after use

THERMOMETER
Not left long enough to acclimatise conditions

MOISTURE METER
Not cleaned inbetween readings

Question 7

Methods of sampling plants

Answer 7

Quadrat

Question 8

Quadrant sources of error

Answer 8

Human judgement can be an issue

Question 9

Method used to sample animals

Answer 9

Pitfall trap

Question 10

Pitfall trap limitations

Answer 10

Not level with the soil

Question 11

What is an indicator species

Answer 11

Species that by their precence or abscence indicate environmental quality/levels of pullution