The initial stage of water absorption by root cells is by

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

Which of the following demonstrates imbibition?

$A$ special type of diffusion,which occurs when water is absorbed by solids causing them to increase in volume,is called:

Give scientific reasons:
$(1)$ Plasmolysis is possible in plant cells,while it is not possible in animal cells.
$(2)$ Doors and windows of a house swell during the monsoon season.

$A$ professor kept some moist seeds in an airtight jar and started lecturing. At the end of the experiment,an explosion occurred in the jar. What did the professor want to explain?