Question

why when we press tongue against the palate we can recognise taste easily

Answer 1

because it has taste bud on it.

Answer 2

A juice is expressed and then saturated by the degastory tendrils,hence its delivered to the substance the passport it requires for admission into the stomach.Thus if in any case we demand what is undrestood by sapid bodies,we get to know that its everything that has flavor,which is soluble,and fit to be absorbed by the organ of taste.