IB Biology HL 4.1.8 Modelling sigmoid growth Question Bank
Practise IB Biology SL/HL 4.1.8 by applying modelling sigmoid growth concepts to exam-style questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- identify the relevant biological structure, process or evidence
- apply the correct biological mechanism to the question
- evaluate the result using data, adaptation or ecological reasoning
C4.1.8—Modelling sigmoid growth question 1
Duckweed (Lemna aequinoctialis) is a small floating plant that sometimes forms a continuous cover over the surface of ponds. In an experiment, it was grown either in nutrient-rich medium or in sewage water for four weeks. The biomass obtained per square metre at different times is shown in the population growth curves.
Label two phases on the nutrient-rich medium population growth curve.
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