CAIE IGCSE Biology 19.4.5 Phases of a Sigmoid Growth Curve
Practise identifying lag, exponential, stationary and death phases on sigmoid population-growth curves.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- label lag, exponential, stationary and death phases from the shape of a growth curve
- link rising, stable or falling population size to the balance between births and deaths
- recognise which named phases are absent from a shortened or incomplete population graph
19.4.5—Lag, exponential (log), stationary question 1
Question (a)
(a)
Genetically modified bacteria were grown in a fermenter. The number of bacteria was measured, and the data are shown in Fig. 5.1.
Fig. 5.1
[ 2 ]
Question (i)
(i)
On Fig. 5.1, draw an X to identify the lag phase.
[ 1 ]
Question (ii)
(ii)
On Fig. 5.1, draw a Y to show where the birth rate is equal to the death rate.
[ 1 ]
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