Question

what is scientific reason behind them sugar is sweet ,chilli is spicy or bitter and lemon is sour​

Answer 1

Explanation:

Miracle berry or Synsepalum dulcificum is a plant native to West Africa. Miracle Fruit contains a glycoprotein called miraculin, which binds to the tongue's taste buds when the fruit is consumed. Miraculin acts as a sweetness inducer when it comes in contact with acids, causing sour foods to taste sweet, temporarily.

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Answer 2

we can feel these by our tongue nodes