Question

The correct sequence of stages of growth curve for bacteria, under favorable condition is
A.Decline, leg, log phase
B.Lag, log, stationary phase
C.Stationary, lag, log, decline phase
D.Lag, log, stationary, decline phase

Answer 1

Hint: Bacteria came under the prokaryotic organisms which reproduce by asexual process through binary fission. These microorganisms show growth at a very high rate under their favorable conditions.

Complete answer:
1.Conditions which are required for growth that is oxygen, pH, temperature, light influence microbial growth, additional factors include osmotic pressure, atmospheric pressure, and moisture availability.
2.Bacteria show the pattern which is easily predictable when grown in culture with favorable conditions.
3.Growth pattern can be represented graphically as the number of living cells in a population over time is understood as a bacterial growth curve.
Bacterial growth curve has divided into four phases:
a.Lag phase
b.Log or exponential phase
c.Stationary phase
d.Death phase

Four phase of growth of bacteria:
Lag phase: It is the initial phase in which bacteria are active metabolically but divided in numbers.
Log phase: It is also known as exponential phase so it is a phase of exponential growth.
Stationary phase: It is the phase when the number of dying cells equals the number of dividing cells.
Death Phase: It is the phase when exponential decreases in the number of living cells. In this phase waste products increase and living cells decrease.

Hence the correct answer is OPTION(D)

Note: Generation time is the time taken by the bacteria population to double. It changes from species to species and depends on growth conditions provided in culture.