bacterial growth curve

Question 1

how many phrases does the sigmoid growth curve have?

Answer 1

The curve has four distinct phases

Question 2

what is a Lag phase?

Answer 2

the population size increases slowly as the microorganism population adjusts to its new environment and gradually starts to reproduce

Question 3

what is a log phase or exponential phase.?

Answer 3

food supply is abundant,birth rate is rapidanddeath rate is low;growth is exponentialand only limited by the number of new individuals that can be produced. (the population doubles with each division)

Question 4

What happens during Stationary phase?

Answer 4

Stationary phase occurs when the population reaches its maximum as it is limited by resources e.g. nutrients, toxic substances. the death rate and birth rate is equal

Question 5

What happens during death phase?

Answer 5

population decreases as death rate is now greater than birth rate; this is usually because food supply is short or metabolic wastes produced by the population have built up to toxic levels

Question 6

what is the correct sequence of stages of the growth curve for Bacteria?

Answer 6

Lag, log, stationary, death phase