Q. Show How Adaptation affecting taste quality?

Adaptation - A low concentration solution will not give any sensation after tasting a higher concentration solution due to the adaption of the tongue for higher concentration. For example, normal water will taste flat because our tongue is adapted to this type of water but when we take hard water, it appears salty. Mineral water/ground water containing many minerals and ions gives a salty taste. Distilled water containing no ions tastes slightly sweet. Tea taken after sugar appears flat i.e. does not gives a bitter perception.