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Which of the following is an example of adhesion in organisms?

Adhesion is a property of water and is an attraction that occurs between two different substances such as water and the cell walls of plant cells.


For example, a tree needs to be able to transport water over a long distance from its roots to the leaves at the top of a tree. Water molecules will stick or adhere to the conducting cells in plants called xylem in the process known as adhesion. The water is attracted to the walls of the xylem tubes.


Cohesion also helps transport water up against the downward force of gravity. This process is due to the polar nature of water molecules and the fact that each molecule can hydrogen-- bond to four additional molecules. This helps water molecules pull up other water molecules below in the xylem tubes creating a column of water that is transported up to the leaves. 


If you observe a spider web outside after it has rained, the water droplets will stick to the spider silk or to blades of grass due to adhesion.


I have attached two links which further illustrate the process of adhesion.

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