Because the receptors of the tongue react to certain compounds like as if they were sweet even though they don't have glucose. Examples of foods that taste sweet yet do not have glucose include sugar alcohols.
The food does not taste sweet because there is over ingredients overpowering the taste of the sweetness. So they are stronger than the glucose.
Glucose is a monosaccharide- a simple sugar. Hence it tastes sweet like sugar.
Other sugars can be present such as fructose.
may be there other ingredients that's taste sweet, its not necessary that glucose must be present, may be artificial sweet, which taste sweet but is not glucose
Starch is composed of glucose monomers. These glucose molecules are linked up in chains, so they do not give a sweet taste. Boiling potatoes does not release glucose from starch.
SWEET FOODS
Sugar is sweet because of the sucrose that is made from two simple sugars, glucose and fructose. Sugar molecules are also detected by our tongue making it taste the sweetness.
because of our taste buds
The front taste buds taste salty and sweet foods. The sides of your tongue taste sour foods. The taste buds on the back of your tongue taste bitter foods.
Most of the time glucose is sweet. for example it is usually found it fruits, baby food, and surprisingly soft drinks. But these are just some of the examples.
Unless you've eaten very little sweet food in your entire life, you will have the desire to eat anything sweet in preference to other foods, so it's unlikely you would need to 'acquire' the taste for sweet spreads such as caramel or hazelnut, or jam. You'd be far more likely to need to acquire a taste for savoury foods such as olive spread and so on.
A food that is sweet will not taste good after you have been getting or drinking something that is sweet as well.
it taste sour a little sour
Your Taste Buds. As you get older, the Taste Buds start losing interest in the foods you eat.
They taste tart, somewhat like tomatoes but less sweet.