Question

Semi Log of per minute growing bacteria is plotted against time. What will be the shape graph?
A. Ascending straight line
B. Sigmoid
C. Hyperbolic
D. Descending straight line

Answer 1

Hint: In biology and biological engineering, the change in numbers of microbes due to asexual reproduction and nutrient exhaustion is commonly represented by semi-log plot. The logarithm of the number or mass or other microbes as dependent variable with the time as independent axis.

Complete answer:
There are four phases in the bacterial growth, the log phase, the exponential phase, the stationary phase and the death phase. In the log phase, bacteria start to grow in a limited population. In the exponential phase, the bacteria start to exponentially multiply and increase in their population to a peak level. After attaining a peak in the bacterial population, it comes to a stationary phase in which the population remains stable. Then, comes the death phase when the population of the bacteria starts reducing and decreasing to a significant level.
Ascending straight line is a graphical representation of increase in growth of bacteria per unit time.
Sigmoid is a graphical representation of the bacterial growth or the growth of an organism without any other factor involved.
Hyperbolic is a graphical representation of the population of an organism with respect to the environmental factors on enzymes.
Descending straight line is a graphical representation of decrease in the growth of the organism.

Hence, the correct option is A. Ascending straight line.

Note: The graph represents the growth of bacteria per unit time. This helps us to know the speed of growth of the bacteria as time is represented by Y-axis and population of bacteria is represented by X-axis.