Name: ________________________________
6th Science, Yale
Cohort__________________
MAS Charter School
Population Growth Quiz
#1) Scenario: :In the circles below Illustrate the population of each culture after 2 days of
growth. Assuming the ‘contaminating bacteria’ are better adapted for sugar consumption than
yeast.
2 Days of Growth
Culture #1
●
●
●
Yeast solution
Excess Sugar
Water
Culture #2
●
●
●
Yeast
No sugar
Water
Culture #3
●
●
●
●
Yeast
Contaminating Bacteria
Limited Sugar
Water
1) What are the biotic and abiotic factors among these three cultures?
2) Is sugar biotic or an abiotic factor and how will it influence the growth of yeast?
Explain why:
3) Explain the interaction between yeast and the contaminating bacteria in the
culture?
Name: ________________________________
6th Science, Yale
Cohort__________________
MAS Charter School
.
#2) Scenario: :In the circles below Illustrate the population of each culture after 10 days of
growth. Assuming the ‘contaminating bacteria’ are better adapted for sugar consumption than
yeast.
10 Days of Growth
Culture #1
●
●
●
Yeast solution
Excess Sugar
Water
Culture #2
●
●
●
Yeast
No sugar
Water
Culture #3
●
●
●
●
Yeast
Contaminating Bacteria
Limited Sugar
Water
4) Why would the cultures look different than 2 days of growth compared to 10 days
of growth?
5) Based on the information in the scenario what does that tell you about the
relationship between yeast and the contaminating bacteria?:
6) Which culture to expect to have a stable population growth for yeast and why?