IB Biology HL C4.1.8 Modelling Sigmoid Growth Questions

Use fast-growing-organism models to identify lag, exponential, transitional and plateau phases from the positions and slopes of sigmoid curves in IB Biology HL C4.1.8.

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Label lag, exponential, transitional and plateau phases on a modelled sigmoid growth curve for a fast-growing organism, using the phase positions and changing slope shown in the data.

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Study C4.1.8—Modelling sigmoid growth conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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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