CAIE IGCSE Biology 19.4.7 Factors That Lead to Each Phase Questions
Practise explaining each growth-curve phase using reproduction, death and limiting factors such as food, space and waste.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- explain the lag phase as slow initial growth while organisms adjust and reproduce slowly
- explain exponential growth by plentiful resources and a birth rate above the death rate
- explain the stationary phase when birth and death rates are equal as limiting factors take effect
- explain the death phase when death exceeds birth, often as resources become limited, competition rises or waste accumulates
CAIE IGCSE Biology 19.4.7 Factors That Lead to Each Phase Questions question 1
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
Describe and explain the change in bacterial population size from 24 hours to 50 hours shown in Fig. 5.1.
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