Case: Read the paragraph and answer the following questions

      There are many phenomena which we observe in nature or at home. For example, raw mangoes shrivel when pickled in brine (salt water). If we look into this processes we find one thing common in all, that is, all these substances are bound by membranes. These membranes appear to be continuous sheets or films, yet they contain a network of sub microscopic holes or pores. Membranes having this kind of properties are known as semipermeable membranes (SPM).  If this membrane is placed between the solvent and solution the solvent molecules will flow through the membrane from pure solvent to the solution. This process of flow of the solvent is called osmosis. The flow of the solvent from its side to solution side across a semipermeable membrane can be stopped if some extra pressure is applied on the solution.  This pressure has been found to depend on the concentration of the solution.

What are those solutions called that have the same osmotic pressure at a given temperature?

Isotonic

The answer is Option 2: Isotonic.

Two solutions that have the same osmotic pressure at a given temperature are called isotonic solutions. This means that the solutions have the same tendency to take in solvents by osmosis.

If a cell is placed in an isotonic solution, there will be no net movement of water into or out of the cell. This is important for cell survival, as it allows the cell to maintain its proper volume.

Option 1 (hypertonic) refers to a solution that has a higher osmotic pressure than another solution. Option 3 (hypotonic) refers to a solution that has a lower osmotic pressure than another solution. Option 4 (normal solutions) is not a technical term.