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IB Biology SL D2.3.4 Changes in Plant Tissue Questions

Use plant-tissue osmosis data to calculate percentage mass change, locate the zero-change intercept, explain tissue differences and judge experiment reliability in IB Biology SL…

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Calculate percentage mass change and use the zero-change graph intercept to estimate isotonic or osmotic concentration of plant tissue.
  • Interpret graph direction relative to the isotonic point to identify hypotonic conditions and count solutions in which potato tissue loses mass.
  • Explain why different plant tissues have different isotonic points by referring to their internal dissolved solutes or growth conditions.
  • Explain why percentage mass change gives a fair comparison between tissue samples with different starting masses.
  • Evaluate reliability of plant-tissue osmosis data from trend, scatter and outlier evidence, and identify controlled variables such as size, time, temperature and drying method.

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Study D2.3.4—Changes in plant tissue conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL D2.3.4 Changes in Plant Tissue Questions question 1

[Maximum number: 3]

An experiment was carried out to determine the change in mass due to osmosis. Potato cubes were soaked in different concentrations of sodium chloride for 12 hours. The table shows the mean data for the mass of potato before and after the 12-hour period.

Table for Question IB Biology SL D2.3.4 Changes in Plant Tissue Questions question 1 — IB Biology SL

Question (a)

(a)

Explain how the data may be used to determine the solute concentration of the potato tissue.

[ 2 ]

Question (b)

(b)

Estimate the solute concentration of the potato tissue.

[ 1 ]
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