1. B2 REVISION – Organisms in their environment
Physical Factor
How does it affect organisms?
Temperature
Nutrients
Amount of light
Availability of water
O2 and CO2 availability
Key definitions:
Mean:
Median:
Mode:
Reproducible data:
Valid data:
Quadrats
What is a quadrat?
What do we use it for?
How do you use it?
What is random sampling?
Transects
What is it?
Explain how do you use a transect
Is it random? 1

2. Factors That Affect Organisms
Temperature
Nutrient availability
Amount of light
Water availability
Oxygen availability
Carbon dioxide availability

3. Quadrats

4. Random Sampling 50
10, 30
50, 20
70, 40
30, 70
etc

5. Transect

7. Validity of the Method Are they using the correct method?
Are they sampling in a systematic or random way?

8. Reproducibility of the Data
Can other people carry out the experiment?
Would they get the same results?

9. Sample Size
A large sample makes data more valid and reproducable