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← Theoretical 1

Q14 — Water Potential — Osmosis Between Three Plant Cells

Theoretical 1 Real exam question — full text reproduced under IBO's CC BY-NC-SA 4.0 license
Water Transport & Transpiration

The diagram shows the water potentials of 3 adjacent plant cells (the water potential of pure water is 0).

Three adjacent plant cells with water potentials -1200 kPa (top), -800 kPa (bottom-left), and -1000 kPa (bottom-right). Three adjacent plant cells: top cell −1200 kPa, bottom-left cell −800 kPa, bottom-right cell −1000 kPa.

Determine for each of the following figures whether the direction of water movement due to osmosis is depicted correctly (true) or not (false).

Four candidate diagrams (1-4) showing different arrow directions for water movement between the three cells. Four candidate diagrams (1–4), each showing a different combination of arrow directions for water movement between the top, bottom-left, and bottom-right cells.

A. Figure 1 correctly depicts the direction of water movement due to osmosis.
B. Figure 2 correctly depicts the direction of water movement due to osmosis.
C. Figure 3 correctly depicts the direction of water movement due to osmosis.
D. Figure 4 correctly depicts the direction of water movement due to osmosis.
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Question reproduced from IBO 2022, Theoretical Paper 1, licensed under CC BY-NC-SA 4.0 — attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)