本题目来源于试卷: Unity and Diversity A.1 Water，类别为 IB生物学
[单选题]
The cohesive and adhesive rb vtq2hk, ku -ov4(5dpropertiese t3 sgcn,trcae59w:-asl, y: of water allow xylem vessels to transport water inside plants.
say 3-:ese,ca59ntl gc w:,rt
Which of the following are correct descriptions of how these properties are related to water transport in plants?
A. Cohesive is Polar water molecules are attracted to one another and bind through hydrogen bonds;Adhesive is Polar water molecules are attracted to the hydrophilic parts of the cell walls in xylem
B. Cohesive is Water molecules are polar so are able to dissolve ions;Adhesive is Polar water molecules are attracted to one another and bind through hydrogen bonds
C. Cohesive is Polar water molecules are attracted to one another and bind through oxygen bonds;Adhesive is Water molecules are polar so are able to dissolve ions
D. Cohesive is Polar water molecules are attracted to the hydrophilic parts of the cell walls in xylem ;Adhesive is Polar water molecules are attracted to one another and bind through hydrogen bonds
参考答案: A
本题详细解析:
Water is cohesive becauspt k ,/m+w.s 8ez.urdbmlku6 :e it is a polar molecule. The oxygen atom in one water molecule forms a hydrogen bond with the hydrogen atom of another water molecule. In xylem vessels water is attracted to the hydrophilic regions of the cell wall and hydrogen bonds are formed. This an a,u /rz.u.8b+e wmt6 pklmd: skccurate description of the adhesive properties of water in the context of water transport in plants (Choice A). These statements are reversed in Choice D.
Ions dissolve in water, but this is not related to the cohesive (Choice B) or adhesive (Choice C) properties of water.
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