Which is a correct order (w.r.t. imbibing capacity in decreasing order)?

In the course of imbibition,the volume of the system

Definitions / Explanation :
$(1)$ Imbibition
$(2)$ Apoplast pathway

An enthusiastic professor,wanting to demonstrate a physiological process,placed soaked mustard seeds in a glass jar and kept it in a corner before starting the lecture. At the end of the lecture,a sudden explosion occurred,and the glass jar shattered into pieces. Which of the following processes was the professor trying to demonstrate?

In seed germination,the first phenomenon that takes place is

Explain the significance of imbibition.