In order to establish the expiration date of perishable food, growth curve data must be collected. Once the microbial load is so high that it poses a hazard to human health, the food item is no longer considered safe (expired). Generally a microbial load of x50,000 bacteria/gram is considered unsafe.
Your task is to determine the microbial growth curves for MicroYo, a new brand of yogurt. The growth is determined by sampling the yogurt and growing the bacterial isolates in broth culture which is then serially diluted by a total of x10,000 and inoculated onto standard petri plates of nutrient agar. The following colony counts are measured:
Time (days) MicroYo colony count
1 1
4 1
12 2
16 4
20 7
a. 4.
b. 16.
c. 20.
d. 12.

The answer is 20 because on 20 days, 7 colonies of Micro Yo occurs. The data of bacterial growth indicates that population of bacteria increases with the passage of time. This increase occurs due to good environmental conditions for bacteria that allows it to grow and increase their population. So we can say that the growth graph moves in the upward direction with the passage of time or number of days.