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 $(b)$?

(N/A) When placed in a salt solution (hypertonic),water moves out of the cell due to exosmosis. As a result,the protoplasm shrinks away from the cell wall,a phenomenon known as plasmolysis.
$(b)$ When the plasmolysed cell is placed in distilled water (hypotonic),water enters the cell due to endosmosis. The protoplasm regains its original position,and the cell becomes turgid.