本题目来源于试卷: SL/HL Topic D2.3 Water potential，类别为 IB生物学
[问答题]
8. Halophytes are plants which live in ar,l/yznu+/7 vn.ej xq*xe l u(qeasrw9f,oht7odm,t l; / m of high salt concentrations. Explain /,rm9; t thl7mood wf,why these plants have ion transport pumps in the membranes of their root hair cells.
参考答案: The concentration of the soil water (water around the roots of the plants) is hypertonic.
To gain water from the environment, the cells must be hypertonic/have a higher solute concentration than the soil water. Ion transport pumps move ions into the root cells to make them hypertonic to the environment. The ion pumps use active transport/pump ions against their concentration gradient.
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