$A$ cell when immersed in a solution,increases in volume,so the external solution is

The process of osmosis involves

Plasmolysis can be used for

Water will be absorbed by root hairs when:

$A$ cell when dipped in $0.5 \ M$ sucrose solution has no effect,but when the same cell is dipped in $0.5 \ M$ $NaCl$ solution,the cell will:

An onion peel was taken and
$(a)$ placed in salt solution for five minutes.
$(b)$ after that it was placed in distilled water.
When seen under the microscope,what would be observed in $(a)$ and $(b)$?