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CAIE IGCSE Biology 3.2.9 Importance of Water Potential Questions

Practise using water-potential gradients and osmosis to explain water uptake or loss by organisms, including consequences for cell volume, turgor and survival.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • explain root water uptake through a water-potential gradient maintained between soil water and root-hair cells
  • link nitrate-ion uptake to lower root water potential and continued osmotic water entry

CAIE IGCSE Biology 3.2.9 Importance of Water Potential Questions question 1

[Maximum number: 1]

Fig. 2.1 is a photomicrograph of the end of a plant root.

Fig. 2.1

Fig. 2.1

Fig. 2.2 shows the results of a study on the rate of uptake of nitrate ions at different points along the root shown in Fig. 2.1.
rate of nitrate ion uptake / pmol per cm2\mathrm{cm}^{2} per s

Fig. 2.2

Fig. 2.2

Explain why the uptake of ions, such as nitrate, is important for the uptake of water in roots.

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