What does an avocado seed has to do with physics?

Growing an avocado tree from seed goes viral on the Internet.  Numerous videos that document the growing plant are to be found on YouTube. The base of the method is to place the seed supported by three/four toothpicks in water.  And here is what a trained physicist's eye spots immediately: the MENISCUS.

There are two menisci (yes, this is the plural) visible in the pictures. 

• A concave meniscus occurs when the liquid is attracted to a surface of another object (adhesive forces).  In the picture, it looks like the water claims the wooden toothpick. 
• A convex meniscus occurs when the forces between liquid particles are stronger than between the particles and the surface (cohesive forces).  Here demonstrated at the surface of an avocado seed.