In the rainy season,wooden doors swell up due to:

The initial stage of water absorption by root cells is by

Dry wooden stakes,if driven into a small crack in a rock and then soaked,can develop enough pressure to split the rock. Such pressure is built up through the phenomenon of

In seed germination,the first phenomenon that takes place is

According to the imbibition theory proposed by Sachs,the ascent of sap takes place in:

How many of the following substances can undergo imbibition?
Wood,seeds,starch,lignin,lipids,gum