The attraction between water molecules and the cell wall of xylem is termed as:
Correct answer: C. Adhesion
- A. Cohesion
- B. Tension
- C. Adhesion
- D. Imbibition
Explanation
Option A: Cohesion refers to the attraction between water molecules themselves, which allows them to stick together and form a continuous column in the xylem. Option B: Tension refers to the force that pulls water up through the xylem, which is caused by transpiration at the leaves. Option C: Adhesion is a molecular attraction between "unlike" molecules. In the case of the xylem, adhesion occurs between water molecules and the molecules of the xylem cell walls. Cohesion is a molecular attraction between "like" molecules. In water, cohesion occurs due to hydrogen bonding between the water molecules.Option D: Imbibition refers to the process by which a solid absorbs water, such as a seed swelling when it takes up water.
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About Plant Nutrition and Transport
Plants require macronutrients and micronutrients for growth, and mineral deficiencies produce recognizable symptoms. Transport involves water and minerals through xylem by transpiration pull, cohesion and adhesion, while phloem translocates sugars from sources to sinks. Root pressure and transpiration are distinct mechanisms.
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