Concept:A red blood cell bursts when it takes in too much water from a surrounding hypotonic solution.This specific bursting of red blood cells is called haemolysis.Explanation:A hypotonic solution has a lower solute concentration than the inside of the red blood cell.Because of this difference, water moves into the red blood cell by osmosis.The entry of water causes the cell to swell.When too much water enters, the red blood cell bursts.The bursting of a red blood cell in a hypotonic solution is known as haemolysis.Answer:B. haemolysis