An onion peel was taken and
Placed in salt solution for five minutes.

An onion peel was taken and After that it was placed in distilled water.

State the reason for the following behaviour of zinc metal: On placing a piece of zinc metal in a solution of mercuric chloride it acquires a shining silvery surface but when it is placed in a solution of magnesium sulphate no change is observed.

When a strip of copper is placed in the solution of silver nitrate, the solution become blue. Why ?

What will happen to a cell placed in a solution of higher concertration?

A fruit or vegetable placed in a concentrated salt solution to prepare pickle, shrivels because

E. coli about to replicate was placed in a medium containing radioactive thymidine for five minutes. Then it was made to replicate in a normal medium. Which of the following observations will be correct?

Active Absorption of salts takes place against the concertration gradient.