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Results
 |
|
| Soil Sample
A |
Soil Sample
B |
|
|
| Soil Sample
C |
Soil Sample
D |
Conclusion
What has happened to the control Petri dish? Does this mean
your results are valid or invalid?
|
Are there any differences between the number of colonies of
micro-organisms which have grown in the four Petri dishes?
Explain any differences you observe.
|
|
When you look at soil you cannot see micro-organisms with the
naked eye. Why can you see the micro-organisms in the Petri
dishes?
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