Name(s) ___________________________________________ Date ________________ Class Period _____

Did you see that Bacteria?

Data Sheet

Figure 1:      Draw your petri dish as soon as you have placed your sample on the agar .

Figure 2:      Draw you petri dish after incubation period

Fig. 2

Data Table 1:        Number of colonies & Number of different colonies on petri dish

Petri dish	Sample Location	Number of Colonies	Number of different Colonies
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

Graphing:

1. Using the data collected on the data table construct two separate line graphs

a. Graph one – comparing number of colonies from each area/petri dish

b. Graph two – comparing number of different colonies from each area/petri dish

2. Remember to use correct method for constructing your graph

3. Attach completed graphs to the back of this data sheet.

Analysis:

1. How many clusters of bacteria appear to be growing in each petri dish?

2. Which petri dish had the most growth? The Least?

3. What might this lead you to hypothesize about the location with the highest growth? With the least growth?

4. Which petri dish contained the most diverse number of colonies? Least diverse number?

5. What might this lead you to hypothesize about the location with the highest diversity? With the least diversity?

6. Why was the agar sterilized before this investigation?

7. What kind of environmental conditions seem to influence where bacteria are found?

8. How can you control the amount of bacteria that you will encounter?

Conclusion:

1. Discuss how the data from this lab has given you information that will help you answer the lab questions.

2. What is the best possible answer for the lab questions based on your data?