IB Biology HL C4.1.8 Modelling Sigmoid Growth Questions

Use fast-growing organisms such as duckweed to model sigmoid population growth. Practise identifying the lag, exponential, transition and plateau phases, and describing how growth rate changes across them.

Exam points

Label or identify the lag, exponential, transition and plateau phases on a sigmoid population-growth model for a fast-growing organism such as duckweed.

[Maximum number: 2]

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.

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Label two phases on the nutrient-rich medium population growth curve.

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IB Biology HL C4.1.8 Modelling Sigmoid Growth Questions question 1